Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Q: Who composed 'Belshazzar's Feast' cantata?

A: belshazzar's feast
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Q: In which 1960's TV series did Clarence the cross-eyed lion appear?

A: clarence, the cross-eyed lion
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Q: Theo van Doesberg, Piet Mondriaan, Vilmos Huizar and Bart van der Leck are identified with what art movement?

A:
vilmos huszar
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