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

Example Input: What was the first British credit card?
Example Output: credit card

Example Input: What horse won the 2009 Grand National?
Example Output: 2009 grand national

Example Input: Which actress joined the cast of `Downton Abbey' in Series 3 playing the mother of the Countess of Grantham?
Example Output:
downton abbey