In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

Ex Input:
A roller coaster is a type of amusement ride that employs a form of elevated railroad track designed with tight turns, steep slopes, and sometimes inversions. People ride along the track in open cars, and the rides are often found in amusement parks and theme parks around the world. LaMarcus Adna Thompson obtained one of the first known patents for a roller coaster design in 1885, related to the Switchback Railway that opened a year earlier at Coney Island. The track in a coaster design does not necessarily have to be a complete circuit, as shuttle roller coasters demonstrate. Most roller coasters have multiple cars in which passengers sit and are restrained. Two or more cars hooked together are called a train. Some roller coasters, notably wild mouse roller coasters, run with single cars.

Ex Output:
when was the first ever roller coaster built

Ex Input:
In his 17 seasons at Anfield, Gerrard won a total of two FA Cups, three League Cups, one UEFA Champions League, one UEFA Cup, one FA Community Shield and one UEFA Super Cup. He was named in the PFA Team of the Year a record eight times, the UEFA Team of the Year and FIFA World XI three times, was named PFA Players' Player of the Year in 2006 and the FWA Footballer of the Year in 2009 and came second to Kenny Dalglish in a Liverpool fan poll of '100 Players Who Shook The Kop' in 2008. Despite collective and individual success, Gerrard never won the Premier League, finishing runner-up with Liverpool on three occasions. He joined Major League Soccer club LA Galaxy in July 2015, spending one-and-a-half seasons there before retiring on 24 November 2016.

Ex Output:
how many premier league titles does steven gerrard have

Ex Input:
The side opposite the right angle is called the hypotenuse (side c in the figure). The sides adjacent to the right angle are called legs (or catheti, singular: cathetus). Side a may be identified as the side adjacent to angle B and opposed to (or opposite) angle A, while side b is the side adjacent to angle A and opposed to angle B.

Ex Output:
what are the sides of a right triangle called