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

Example Input: Who has taken over the TV role of Doctor Who, from actor David Tennant?
Example Output: doctor who

Example Input: Devil's Tower National Monument in Wyoming, USA features prominently in which landmark 1977 science fiction film?
Example Output: devils tower

Example Input: Which was the first film in colour to win an Oscar for Best Picture?
Example Output:
academy award for best picture