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

Example Input: Which former Blue Peter presenter died in April 2004, aged 41?
Example Output: blue peter

Example Input: What is the Army equivalent to a Group Captain in the R.A.F.?
Example Output: british army

Example Input: Which instrument did the jazz musician 'Dizzy' Gillespie play?
Example Output:
dizzy gillespie