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: Gynaecology & Obstetrics
[{'content': "A 40-year old man presented with acute onset pain and swelling of left great toe. On X-ray, punched out lytic lesion seen on phalanx with sclerotic margins and overhanging bony edges. Diagnosis is: \nSelect and explain. \nA. Gout, B. Rheumatoid ahritis, C. Psoriatic ahritis, D. Reiter's syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Gout', 'role': 'assistant'}]