Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Example Input: Harry, Tom, Dougie and Danny are collectively known as who in the pop world?
Example Output: dougie poynter

Example Input: Basil Rathbone made 14 Sherlock Holmes films. Who played the part of Dr Watson?
Example Output: watson

Example Input: Sweet Vermouth, Angostura Bitters and Bourbon Whiskey are the ingredients of which cocktail?
Example Output:
cocktail