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: Does long-term nitrate therapy after acute myocardial infarction improve or aggravate prognosis?
Answer: Long-term nitrate therapy after AMI neither improves nor aggravates prognosis. Prospective randomized clinical trials are warranted to determine the effects of long-term nitrate therapy for secondary prevention of AMI.
no