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: Do tNF- inhibitors impair sperm quality in males with ankylosing spondylitis after short-term or long-term treatment?
Answer: Sperm quality in patients with active AS and after receiving short- and long-term TNF- blocker therapy is comparable to sperm quality in healthy controls. Our study confirms that the disease process of AS does not have a major impact on sperm quality and that treatment with anti-TNF has no negative impact on sperm quality even under long-term treatment.
A:
no