Instructions: 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: Is number of positive preoperative biopsy cores a predictor of positive surgical margins ( PSM ) in small prostates after robot-assisted radical prostatectomy ( RARP )?
Answer: A preoperative biopsy with 3 positive cores in men with small prostates predicts PSM after RARP. In small prostates with PSM, a PSA level of >20ng/dL is a predictor of BCR. These factors should guide the choice of therapy and indicate the need for closer postoperative follow-up.
Output:
yes