Input question: What is black gold and Texas tea

Output answer: oil

Input question: Marble is formed by the metamorphosis of which rock?

Output answer: limestone

Input question: What is the title of the second novel featuring Sherlock Holmes, by Arthur Conan Doyle?

Output answer: sign of four

Input question: In June 2011, FBI arrested Boston mob boss James 'Whitey' Bulger near Los Angeles after a 16 year manhunt. He was the inspiration behind the character of Frank Costello in which Oscar-winning film?

Output answer:
departed