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

Example Input: 'Edward Lewis' and 'Vivian Ward' were the principal characters in which popular 1990 film?
Example Output: edward lewis

Example Input: In which British city would you find Barlinnie prison?
Example Output: hm prison barlinnie

Example Input: Which group had a top ten hit with 'Driving in My Car' in 1982?
Example Output:
driving in my car