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: Court Philippe Chatrier, which has stands named after Jacques Toto Brugnon, Jean Borotra, Henri Cochet, and Ren Lacoste, is the main court of an international tennis venue in which city?

Answer: stade roland garros


Question: What was Paul McCartney's first solo album called?

Answer: album


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

Answer:
alfred fielding