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: They are not transcribed happens to structural genes in the presence of tryptophan. Question: What happens to structural genes in the presence of tryptophan?
[A]: they are not transcribed

[Q]: Sentence: Earthquakes mark the motions of colliding plates and the locations where plates plunge into the mantle. Question: Earthquakes mark the motions of colliding plates and the locations where plates plunge into what?
[A]: the mantle

[Q]: Sentence: Stem basic plant structure facilitates dispersal of pollen and fruit by raising reproductive structures. Question: What basic plant structure facilitates dispersal of pollen and fruit by raising reproductive structures?
[A]:
stem