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

Example Input: Who directed the film `Back To The Future`?
Example Output: back to the future

Example Input: In music, which band consists of Billy Gibbons, Dusty Hill and Frank Beard?
Example Output: frank beard

Example Input: In which city were the 1920 Olympic games held Oslo, Antwerp or Stockholm?
Example Output:
1920 summer olympics

