In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Q: Sentence: Acid rain may be caused by air pollution. Question: Acid rain may be caused by what?

A: air pollution
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Q: Sentence: The sporophyte phase is the longest phase in the life of a(n) gymnosperm. Question: The sporophyte phase is the longest phase in the life of what?

A: gymnosperm
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Q: Sentence: When gas particles collide, these collisions are considered elastic. Question: When gas particles collide, what kinds of collisions are these considered?

A:
elastic
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