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': 'In primary idiopathic polymyositis, the following group of muscles is almost never affected - \nSelect and explain. \nA. Proximal limb girdle muscles, B. Pharyngeal muscles, C. Extensor neck muscles, D. Ocular muscles', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]