Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Input: Consider Input: 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

Output: Which agency did this?


Input: Consider Input: Sentence: The Obama administration is developing additional screening protocols for airline passengers both overseas and in the United States to control infectious diseases such as Ebola , President Barack Obama said Monday .<sep>Span: Ebola ,

Output: Why is the United States concerned about Ebola?


Input: Consider Input: Sentence: She is one of many experts who have combed the terrain for clues on the origin of these potentially dangerous holes , which are about a foot in diameter and seem to survive for less than a day before filling in naturally with sand .<sep>Span: potentially dangerous holes ,


Output: How are these holes particularly dangerous?


