TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: boundary between air masses that is stalled in one place. Answer: aids

SOLUTION: Opportunistic diseases are usually the direct cause of death of people with what disease?

PROBLEM: Passage: Momentum is a vector quantity that has the same direction as the velocity of the object. Answer: object ' s velocity

SOLUTION: Momentum is a vector quantity that has the same direction as what?

PROBLEM: Passage: An amine consists of a nitrogen atom bonded to some combination of carbons and hydrogens. Answer: an amine

SOLUTION:
What consists of a nitrogen atom bonded to some combination of carbons and hydrogens?