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

Input: Consider Input: What's the name of Doctor Who's home planet ?

Output: doctor who


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

Output: airline


Input: Consider Input: In Greek mythology, whose wife was Clytemnestra ?


Output: clytemnestra