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

Example Input: In which wars did the battles of Towton and Barnet take place?
Example Output: battle of barnet

Example Input: Which motor manufacturer produces the Duster model?
Example Output: dacia duster

Example Input: Several associates of which gangster were killed by Al Capone's gang in the 'St. Valentine's Day Massacre' in 1929?
Example Output:
saint valentine's day massacre