Detailed 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.
Q: Question: Is l-arginine , the natural precursor of NO , effective for preventing bone loss in postmenopausal women?
Answer: We conclude from these results that supplementation with L-arginine hydrochloride is not effective for improving bone mass in humans.
A:
no