instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
In which Shakespeare play do the characters Ajax, Achilles and Ulysses appear?
answer:
achilles


question:
Which former Blue Peter presenter died in April 2004, aged 41?
answer:
blue peter


question:
The Brockman family's home was the setting for which BBC TV comedy series?
answer:

bbc one