Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

Example Input: Three of the Galilean moons of Jupiter are Io, Europa and Callisto. Which is the fourth?
Example Output: ganymede

Example Input: Who painted ' The Surrender at Breda ' and ' Las Meninas ' ?
Example Output: diego velazquez

Example Input: In the BBC comedy TV series 'It Ain't Half Hot Mum', who played the part of Gunner Beaumont?
Example Output:
melvyn hayes