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:
Who composed 'Belshazzar's Feast' cantata?
answer:
belshazzar's feast


question:
What is the third largest port of Belgium, accessed by a canal 200 metres (660 feet) wide and 32 kilometres (20 miles) long, which ends near the Dutch port of Terneuzen?
answer:

belgium