Task: Answer Verification
Input (English): 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.
Output (English): no