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': "Which is NOT a feature of polymyositis -a) Ocular muscle involvementb) Gottron's rashc) Proximal muscle involvementd) Pain in limbs \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]