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: Manchild and Buffalo Stance were hits for which singer?

Answer: manchild

Question: Who was Domenikos Theotocopoulos better known as?

Answer: museum of el greco

Question: Antonia Robinson and Anna Valentine, London designers who work under the name Robinson Valentine, designed a cream-coloured dress and coat worn by whom at her wedding to Prince Charles on 9 April 2005?

Answer:
charles