Given a statement and question, generate the answer to the question such that the answer is contained in the statement.

statement: Sperm exits the body through the same place as urine., question: Sperm exits the body through the same place as what?
urine

statement: a directory of the types of hemoglobin in the family tree is a useful tool for studying inheritance patterns, question: What is a useful tool for studying inheritance patterns?
hemoglobin

statement: an inmature frog changes into a frog, question: What changes into a frog?
an inmature frog