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: Which football team play home games at Bloomfield Road?

Answer: bloomfield road

Question: Who had a hit album with Back to Bedlam in 2005?

Answer: back to bedlam

Question: Which common material was invented by Marc Chavannes and Alfred Fielding in 1957 initially as textured wallpaper?

Answer:
alfred fielding