instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
In 1867 who became the first Prime Minister of Canada?
answer:
prime minister of canada


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


question:
What is the principal language of Bulgaria?
answer:

bulgaria