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: Come Clean was the debut album by which 2000s band?

Answer: come clean

Question: Aragon and Castile joined to form which country?

Answer: aragon

Question: In 1932 the Kingdom of Hejaz and Nejd unified with the principal regions of Al-Hasa and Qatif to form which country?

Answer:
al-hasa