In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[EX Q]: Question: What phase is pure chlorine present as? Answer: gas
[EX A]: Gas phase is pure chlorine present as.

[EX Q]: Question: What signals the secretion of gastric acid? Answer: gastrin
[EX A]: Gastrin signals the secretion of gastric acid.

[EX Q]: Question: What do convergent plate boundaries with trenches have? Answer: volcanoes
[EX A]:
Volcanoes do convergent plate boundaries with trenches have.