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.
Q: Question: Is low percentage of free prostate-specific antigen ( PSA ) a strong predictor of later detection of prostate cancer among Japanese men with serum levels of total PSA of 4.0 ng/mL or less?
Answer: A low %fPSA is a strong predictor of a subsequent diagnosis of prostate cancer among men with tPSA levels 4.0 ng/mL. Measurement of %fPSA might enhance the detection of high-grade cancer that warrants aggressive treatment.
A:
yes