Input: To what does Microsoft 's Windows 3 owe its success ?

What kind of thing would answer this question?
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Output: entity


Input: What U.S. city 's skyline boasts the Gateway Arch ?

What kind of thing would answer this question?
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Output: location


Input: What Don McLean song laments the day Buddy Holly died ?

What kind of thing would answer this question?
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Output:
entity