Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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Question: In 2011, Christian Bale won a Best Supporting Actor Oscar for his role as an assistant to his half-brother in which boxing related film?

Answer: christian bale

Question: What is the official language of the Dominican Republic?

Answer: dominican republic

Question: The assassination of which Austrian royalty precipitated World War I?

Answer:
assassination of archduke franz ferdinand of austria