Problem: Frédéric Chopin:

All of Chopin's compositions include the piano. Most are for solo piano, though he also wrote two piano concertos, a few chamber pieces, and some songs to Polish lyrics. His keyboard style is highly individual and often technically demanding; his own performances were noted for their nuance and sensitivity. Chopin invented the concept of instrumental ballade. His major piano works also include mazurkas, waltzes, nocturnes, polonaises, études, impromptus, scherzos, preludes and sonatas, some published only after his death. Influences on his compositional style include Polish folk music, the classical tradition of J. S. Bach, Mozart and Schubert, the music of all of whom he admired, as well as the Paris salons where he was a frequent guest. His innovations in style, musical form, and harmony, and his association of music with nationalism, were influential throughout and after the late Romantic period.

What instrument did every composition by Frédéric include?
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A: piano


Problem: In March 2008, it was announced that Avicenna's name would be used for new Directories of education institutions for health care professionals, worldwide. The Avicenna Directories will list universities and schools where doctors, public health practitioners, pharmacists and others, are educated. The project team stated "Why Avicenna? Avicenna ... was ... noted for his synthesis of knowledge from both east and west. He has had a lasting influence on the development of medicine and health sciences. The use of Avicenna's name symbolises the worldwide partnership that is needed for the promotion of health services of high quality."
What is Avicenna's name not needed for?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The basic air defence unit is typically a battery with 2 to 12 guns or missile launchers and fire control elements. These batteries, particularly with guns, usually deploy in a small area, although batteries may be split; this is usual for some missile systems. SHORAD missile batteries often deploy across an area with individual launchers several kilometres apart. When MANPADS is operated by specialists, batteries may have several dozen teams deploying separately in small sections; self-propelled air defence guns may deploy in pairs.
Which missile batteries often have individual launchers several kilometres from one another?
A: SHORAD


Context and question: In September 1940 the first Alsatian resistance movement led by Marcel Weinum called La main noire (The black hand) was created. It was composed by a group of 25 young men aged from 14 to 18 years old who led several attacks against the German occupation. The actions culminated with the attack of the Gauleiter Robert Wagner, the highest commander of Alsace directly under the order of Hitler. In March 1942, Marcel Weinum was prosecuted by the Gestapo and sentenced to be beheaded at the age of 18 in April 1942 in Stuttgart, Germany. His last words will be: "If I have to die, I shall die but with a pure heart". From 1943 the city was bombarded by Allied aircraft. While the First World War had not notably damaged the city, Anglo-American bombing caused extensive destruction in raids of which at least one was allegedly carried out by mistake. In August 1944, several buildings in the Old Town were damaged by bombs, particularly the Palais Rohan, the Old Customs House (Ancienne Douane) and the Cathedral. On 23 November 1944, the city was officially liberated by the 2nd French Armoured Division under General Leclerc. He achieved the oath that he made with his soldiers, after the decisive Capture of Kufra. With the Oath of Kuffra, they swore to keep up the fight until the French flag flew over the Cathedral of Strasbourg.
In what month and year was Marcel Weinum captured?
Answer: unanswerable


Question: A database management system (DBMS) is a computer software application that interacts with the user, other applications, and the database itself to capture and analyze data. A general-purpose DBMS is designed to allow the definition, creation, querying, update, and administration of databases. Well-known DBMSs include MySQL, PostgreSQL, Microsoft SQL Server, Oracle, Sybase, SAP HANA, and IBM DB2. A database is not generally portable across different DBMSs, but different DBMS can interoperate by using standards such as SQL and ODBC or JDBC to allow a single application to work with more than one DBMS. Database management systems are often classified according to the database model that they support; the most popular database systems since the 1980s have all supported the relational model as represented by the SQL language.[disputed – discuss] Sometimes a DBMS is loosely referred to as a 'database'.
Is there an answer to this question: When did popular database systems stop releasing updates?

Answer: unanswerable


Capacitors may catastrophically fail when subjected to voltages or currents beyond their rating, or as they reach their normal end of life. Dielectric or metal interconnection failures may create arcing that vaporizes the dielectric fluid, resulting in case bulging, rupture, or even an explosion. Capacitors used in RF or sustained high-current applications can overheat, especially in the center of the capacitor rolls. Capacitors used within high-energy capacitor banks can violently explode when a short in one capacitor causes sudden dumping of energy stored in the rest of the bank into the failing unit. High voltage vacuum capacitors can generate soft X-rays even during normal operation. Proper containment, fusing, and preventive maintenance can help to minimize these hazards.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What can happen to capacitors used in low energy capacitor banks?
Ah, so..
unanswerable