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.

[Q]: Question: Does blood flow increase or decrease when blood vessels constrict? Answer: decrease
[A]: Blood flow decrease when blood vessels constrict.

[Q]: Question: Acne and different types of cancer can affect what large organ? Answer: skin
[A]: Acne and different types of cancer can affect skin large organ.

[Q]: Question: The cubic crystal system is composed of how many different types of unit cells? Answer: three
[A]:
The cubic crystal system is composed of three many different types of unit cells.