Input: Read this: Greece's rail network is estimated to be at 2,548 km. Rail transport in Greece is operated by TrainOSE, a subsidiary of the Hellenic Railways Organization (OSE). Most of the country's network is standard gauge (1,565 km), while the country also has 983 km of narrow gauge. A total of 764 km of rail are electrified. Greece has rail connections with Bulgaria, the Republic of Macedonia and Turkey. A total of three suburban railway systems (Proastiakos) are in operation (in Athens, Thessaloniki and Patras), while one metro system is operational in Athens with another under construction.
Question: What gauge is none of Greece's railway?

Output: unanswerable


QUES: This makes for a large number of takeoffs and landings and it is not unusual for flights to be delayed in the holding pattern before landing. Following the airport's master plan, Infraero built a second runway, which was finished in 2006. In 2007, the airport handled 11,119,872 passengers. The main building's third floor, with 12 thousand square meters, has a panoramic deck, a food court, shops, four movie theatres with total capacity of 500 people, and space for exhibitions. Brasília Airport has 136 vendor spaces. The airport is located about 11 km (6.8 mi) from the central area of Brasília, outside the metro system. The area outside the airport's main gate is lined with taxis as well as several bus line services which connect the airport to Brasília's central district. The parking lot accommodates 1,200 cars. The airport is serviced by domestic and regional airlines (TAM, GOL, Azul, WebJET, Trip and Avianca), in addition to a number of international carriers. In 2012, Brasília's International Airport was won by the InfrAmerica consortium, formed by the Brazilian engineering company ENGEVIX and the Argentine Corporacion America holding company, with a 50% stake each. During the 25-year concession, the airport may be expanded to up to 40 million passengers a year.

How many passengers came through Brasilia's airport in 2007?
What is the answer?
ANS: 11,119,872


QUES: According to some historians, Bismarck adroitly created a diplomatic crisis over the succession to the Spanish throne, then edited a dispatch about a meeting between King William of Prussia and the French ambassador, to make it appear that the French had been insulted. The French press and parliament demanded a war, which the generals of Napoleon III assured him that France would win. Napoleon and his Prime Minister, Émile Ollivier, for their parts sought war to solve their problems with political disunity in France. On 16 July 1870, the French parliament voted to declare war on the German Kingdom of Prussia and hostilities began three days later. The German coalition mobilised its troops much more quickly than the French and rapidly invaded northeastern France. The German forces were superior in numbers, had better training and leadership and made more effective use of modern technology, particularly railroads and artillery.
Where did the quickly mobilised troops first invade in France?

ANS: northeastern France


Nonetheless, within a few years of his death, Gregory of Nazianzus called him the "Pillar of the Church". His writings were well regarded by all Church fathers who followed, in both the West and the East, who noted their rich devotion to the Word-become-man, great pastoral concern, and profound interest in monasticism. Athanasius is counted as one of the four great Eastern Doctors of the Church in the Roman Catholic Church. In the Eastern Orthodox Church, he is labeled the "Father of Orthodoxy". Some Protestants label him "Father of the Canon". Athanasius is venerated as a Christian saint, whose feast day is 2 May in Western Christianity, 15 May in the Coptic Orthodox Church, and 18 January in the other Eastern Orthodox Churches. He is venerated by the Oriental and Eastern Orthodox Churches, the Roman Catholic Church, the Lutherans, and the Anglican Communion.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): On what day did Gregory of Nazianzus call Athanasius the "Pillar of the Church"?
Ah, so.. unanswerable


Question: In 1816, the United Kingdom annexed the islands, ruling them from the Cape Colony in South Africa. This is reported to have primarily been a measure to ensure that the French would be unable to use the islands as a base for a rescue operation to free Napoleon Bonaparte from his prison on Saint Helena. The occupation also prevented the United States from using Tristan da Cunha as a cruiser base, as it had during the War of 1812.
Try to answer this question if possible: In what year did the islands annex the United Kingdom?
Answer: unanswerable


Input: Read this: The organizational structure as shown above is responsible for the peacetime organization, equipping, and training of aerospace units for operational missions. When required to support operational missions, the Secretary of Defense (SECDEF) directs the Secretary of the Air Force (SECAF) to execute a Change in Operational Control (CHOP) of these units from their administrative alignment to the operational command of a Regional Combatant Commander (CCDR). In the case of AFSPC, AFSOC, PACAF, and USAFE units, forces are normally employed in-place under their existing CCDR. Likewise, AMC forces operating in support roles retain their componency to USTRANSCOM unless chopped to a Regional CCDR.
Question: What does the abbreviation CHOP stand for? 

Output:
Change in Operational Control