TASK DEFINITION: Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.
PROBLEM: Sentence: And gun supporters are encouraging delegates , alternates and guests to carry black powder guns inside .<sep>Span: black powder guns

SOLUTION: What are black powder guns?

PROBLEM: Sentence: A New York City commuter train rounding a riverside curve derailed Sunday , killing four people and injuring more than 60 in a crash that threw passengers from the toppling cars and left a snaking chain of twisted wreckage just inches from the water .<sep>Span: derailed Sunday ,

SOLUTION: Why did the train derail?

PROBLEM: Sentence: Under mounting pressure from new revelations that the United States collected the telephone data of tens of millions of Europeans , the Obama administration on Monday said that there is a need for new constraints on U . S . intelligence - gathering operations and a top senator announced that the spying on U . S . allies would stop .<sep>Span: U . S . intelligence - gathering operations

SOLUTION:
Which agency did this?

