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.

Input: Consider Input: Sentence: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only contract. Question: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only do what?

Output: contract

Input: Consider Input: Sentence: Density of matter reflects how closely packed the particles of matter are. Question: What physical property of matter reflects how closely packed the particles of matter are?

Output: density

Input: Consider Input: Sentence: The cell starting meiosis is called a primary oocyte. Question: The cell starting meiosis is called a what?
Output: primary oocyte