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

Example Input: Which entertainer uses various names, including Puff Daddy, P. Diddy and Diddy?
Example Output: p. diddy

Example Input: With which song did Swedish pop group Abba win the 1974 Eurovision Song Contest?
Example Output: abba

Example Input: Which pop group had a number one hit record in the 1990s with 'Don't Look Back in Anger'?
Example Output:
don't look back in anger