[Q]: What is the question to: "Matches are played between two teams of seven players riding flying broomsticks, using four balls and six elevated ring-shaped goals, three on each side of the Quidditch pitch (field)."? The topic is Quidditch.
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[A]: "what are the players in Quidditch??"

[Q]: What is the question to: "The Catcher in the Rye is a 1951 novel by J. D. Salinger ."? The topic is The Catcher in the Rye.
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[A]: "who is the book the catcher in the rye by??"

[Q]: What is the question to: "Richard Milhous Nixon (January 9, 1913 April 22, 1994) was the 37th President of the United States , serving from 1969 to 1974, when he became the only president to resign the office."? The topic is Richard Nixon.
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[A]: "when president nixon resigns?"

[Q]: What is the question to: "Silk is a natural protein fibre , some forms of which can be woven into textiles ."? The topic is Silk.
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[A]:
"what can silk be used for?"