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

Example Input: What is the alcoholic ingredient of a Screwdriver cocktail?
Example Output: screwdriver

Example Input: In which film did Sharon Stone play the character 'Catherine Tramell?
Example Output: catherine tramell

Example Input: Which band did David Coverdale form afer he left Deep Purple?
Example Output:
deep purple