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

Example Input: Established in 1919, which is the world's oldest surviving airline?
Example Output: airline

Example Input: Who wrote the novel 'Brideshead Revisited'?
Example Output: brideshead revisited

Example Input: California is bordered by 3 states, Arizona and Nevada are two name the third,?
Example Output:
california