system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In a middle aged male having back pain, syndesmophytes involving 4 continous veebrae are seen on Xray. The patient has ?
assistant
The correct answer is  Ans. is 'b' i.e., Ankylosing spondylitis Back pain with syndesmatophytes in a middle aged man suggest the diagnosis of ankylosing spondylitis.