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 histopathologic evidence that sacroiliitis in ankylosing spondylitis merely enthesitis?
Answer: In the sacroiliitis of AS, two findings predominate: 1) synovitis and subchondral bone marrow changes offer a more rational explanation for widespread joint destruction than does enthesitis; and 2) an unusual form of chondroid metaplasia contributes to ankylosis.
A:
no