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

Example Input: The Briish Airways subsidiary BA Connect was sold to which other airline?
Example Output: airline

Example Input: After Harold McMillan who was Britain's next Prime Minister?
Example Output: britain

Example Input: Who was the hero of several Sir Arthur Canon Doyle stories, first introduced in The Lost World?
Example Output:
the lost world