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: Surgery
[{'content': 'In patients with osteoahritis of knee joint, atrophy occurs most commonly in which muscle : \nSelect and explain. \nA. >Qudriceps only, B. >Hamstrings only, C. >Both (a) and (b), D. >Gastrocnemius', 'role': 'user'}, {'content': "Answer: A \nExplanation: Quadriceps only Met Maheshwari 3/e, p 253;Apley's 8/e, p 472] In osteoahritis of knee joint, the quadriceps muscle is usually wasted.", 'role': 'assistant'}]