instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who was Prime Minister of Australia at the outbreak of World War I?
answer:
australia

question:
Richard Addinsell's most famous piece of music was used in the 1941 film 'Dangerous Moonlight', what is its title?
answer:
dangerous moonlight

question:
What is the official language of Brazil?
answer:
brazil