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

Example Input: In which 1960's TV series did Clarence the cross-eyed lion appear?
Example Output: clarence, the cross-eyed lion

Example Input: Who played the character Gene Hunt in the UK TV series 'Life on Mars' and 'Ashes to Ashes'?
Example Output: life on mars

Example Input: Which British composer wrote The Dam Busters March?
Example Output:
the dam busters march