Definition: 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.
Input: Question: Does serum Mac-2BP distinguish men with high grade , large volume prostate cancer from men with benign prostatic hyperplasia?
Answer: Serum Mac-2BP does not appear to originate in the prostate and it is unlikely that Mac-2BP can be used for the differential diagnosis of prostate cancer versus BPH.
Output:
no