Problem: Please answer a question about the following article about Elevator:
Elevator doors protect riders from falling into the shaft. The most common configuration is to have two panels that meet in the middle, and slide open laterally. In a cascading telescopic configuration (potentially allowing wider entryways within limited space), the doors roll on independent tracks so that while open, they are tucked behind one another, and while closed, they form cascading layers on one side. This can be configured so that two sets of such cascading doors operate like the center opening doors described above, allowing for a very wide elevator cab. In less expensive installations the elevator can also use one large "slab" door: a single panel door the width of the doorway that opens to the left or right laterally. Some buildings have elevators with the single door on the shaft way, and double cascading doors on the cab.
What design allows wider entryways within limited space?
A: a cascading telescopic configuration
Problem: Please answer a question about the following article about San Diego:
The city is governed by a mayor and a 9-member city council. In 2006, the city's form of government changed from a council–manager government to a strong mayor government. The change was brought about by a citywide vote in 2004. The mayor is in effect the chief executive officer of the city, while the council is the legislative body. The City of San Diego is responsible for police, public safety, streets, water and sewer service, planning and zoning, and similar services within its borders. San Diego is a sanctuary city, however, San Diego County is a participant of the Secure Communities program. As of 2011[update], the city had one employee for every 137 residents, with a payroll greater than $733 million.
In what year did the city vote to change to a strong mayor government?
A: 2004
Problem: Please answer a question about the following article about Economy of Greece:
In recent years a number of well-known tourism-related organizations have placed Greek destinations in the top of their lists. In 2009 Lonely Planet ranked Thessaloniki, the country's second-largest city, the world's fifth best "Ultimate Party Town", alongside cities such as Montreal and Dubai, while in 2011 the island of Santorini was voted as the best island in the world by Travel + Leisure. The neighbouring island of Mykonos was ranked as the 5th best island Europe. Thessaloniki was the European Youth Capital in 2014.
What Greek city was rated the world's fifth best ultimate party town by 2009's Lonely Planet?
A: Thessaloniki
Problem: Please answer a question about the following article about Pharmaceutical industry:
Other notable new vaccines of the period include those for measles (1962, John Franklin Enders of Children's Medical Center Boston, later refined by Maurice Hilleman at Merck), Rubella (1969, Hilleman, Merck) and mumps (1967, Hilleman, Merck) The United States incidences of rubella, congenital rubella syndrome, measles, and mumps all fell by >95% in the immediate aftermath of widespread vaccination. The first 20 years of licensed measles vaccination in the U.S. prevented an estimated 52 million cases of the disease, 17,400 cases of mental retardation, and 5,200 deaths.
What did the first measles prevent in it's first 20 years?
A:
an estimated 52 million cases of the disease, 17,400 cases of mental retardation, and 5,200 deaths