What is the question to: "The tropics is a region of the Earth surrounding the Equator ."? The topic is Tropics.
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Answer: "what zones are tropical?"

What is the question to: "The English Renaissance was a cultural and artistic movement in England dating from the late 15th and early 16th centuries to the early 17th century."? The topic is English Renaissance.
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Answer: "what is renaissance english?"

What is the question to: "The stars of the show were Mister Ed, a palomino horse who could "talk", played by gelding Bamboo Harvester and voiced by former Western star Allan Lane (who went uncredited for the entire length of the series), and his owner, an eccentric and enormously klutzy , yet friendly, architect named Wilbur Post ( Alan Young )."? The topic is Mister Ed.
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Answer:
"what kind of horse was mr ed?"