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

Example Input: Sentence: Water streamed down Dennis Jenkins ' glasses , dripping off the tip of his nose , as he surveyed the scrap yard not far from where the shuttles once blasted into orbit .<sep>Span: Dennis Jenkins '
Example Output: Who was Dennis Jenkins?

Example Input: Sentence: Silver has long been known for its ability to kill some of the nasty microbes that can make people sick .<sep>Span: some of the nasty microbes
Example Output: Which nasty microbes?

Example Input: Sentence: Tens of thousands of people from across the nation gathered at the National Mall Saturday to commemorate the 50th anniversary of the March on Washington and to rally for what they believe is the unfinished business of the civil rights battle .<sep>Span: National Mall
Example Output:
What is the National Mall?