instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What horse won the 2009 Grand National?
answer:
2009 grand national

question:
Which football team play home games at Bloomfield Road?
answer:
bloomfield road

question:
In response to a Soviet blockade, June 26th, 1948, saw the Western Allies begin an airlift to what city?
answer:
berlin blockade