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.

[EX Q]: Sentence: Property to time kind of variation does a rate measure. Question: What kind of variation does a rate measure?
[EX A]: property to time

[EX Q]: Sentence: Most skin structures originate in the dermis. Question: Where do most skin structures originate in?
[EX A]: dermis

[EX Q]: Sentence: A(n) radioisotopes is an isotope that is radioactive. Question: What is an isotope that is radioactive called?
[EX A]:
radioisotopes