instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which BBC current affairs programme, the longest-running in the world, is 60 years old this year ?
answer:
bbc

question:
Which American city has baseball-playing 'Dodgers'?
answer:
los angeles dodgers

question:
Which architect designed the Queen's House Greenwich and the Banqueting House in Whitehall?
answer:
banqueting house, whitehall