This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'A 35 year old male patient develops involvement of proximal and distal interphalangeal joints and 1st canpo-metacarpal joints with sparing of wrist and metacarophalangeal joint. The Diagnosis is: \nSelect and explain. \nA. Osteoahritis, B. Psoriatic ahropathy, C. Rheumatoid ahritis, D. Pseudogout', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Osteoahritis)', 'role': 'assistant'}]