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: 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

SOLUTION: What is the National Mall?

PROBLEM: Sentence: It might seem like a culinary aberration , but it isn ' t .<sep>Span: it isn ' t

SOLUTION: Why isn't it weird that there's Thai food in Mexico?

PROBLEM: Sentence: Some of the roughly 150 passengers on the early morning Metro - North train from Poughkeepsie to Manhattan were jolted from sleep around 7 : 20 a . m . to screams and the frightening sensation of their compartment rolling over on a bend in the Bronx where the Hudson and Harlem rivers meet .<sep>Span: compartment rolling over on a bend in the

SOLUTION:
What exactly made the train flip? Was this a particularly fast turn?