Given the task definition and input, reply with output. Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.

Question: Is high expression of GTPase regulator associated with the focal adhesion kinase ( GRAF ) a favorable prognostic factor in acute myeloid leukemia?
Answer: We provide evidence that high GRAF expression is a favorable prognostic marker in patients with AML.
yes