instruction:
Given a statement and question, generate the answer to the question such that the answer is contained in the statement.
question:
statement: upper arm muscles contracting causes a person 's elbow to elongate, question: What muscle contracting causes a person's elbow to elongate?
answer:
upper arm

question:
statement: accipitridae eggs have hard, calcium carbonate shells., question: What type of shells do accipitridae eggs have?
answer:
hard, calcium carbonate

question:
statement: A chain wrapped around a wheel is used for lifting blocks., question: What is a chain wrapped around a wheel used for?
answer:
lifting blocks