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': 'Primary idiopathic polymyositis does not involve - \nSelect and explain. \nA. Pelvic girdle muscles, B. Neck muscles, C. Ocular muscles, D. Pharyngeal muscles', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]