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

Example Input: Who played Lionel Hardcastle in the TV series 'As Time Goes By'?
Example Output: as time goes by

Example Input: Eden Park staged some of the 2011 Rugby World Cup matches, in which city can it be found?
Example Output: eden park

Example Input: What was Diana Ross's first solo No 1?
Example Output:
diana ross