This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joint disorders, Subject name: Orthopaedics
[{'content': "Examine knee x ray carefully. Diagnosis:- \nSelect and explain. \nA. TB, B. Gout, C. Charcot's disease, D. RA", 'role': 'user'}, {'content': "Answer: C \nExplanation: The given knee x-ray shows bilateral joint destruction. In osteoahritis and rheumatoid ahritis- joint destruction but some anatomical features and shape of joint will be preserved. Gout usually occurs in 1st metatarsal joint. Charcot's disease (neuropathic ahritis) is a cause of joint destruction because of loss of proprioceptive fibers and pain sensibility. It is commonly seen in diabetic patients", 'role': 'assistant'}]