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 one of the following clinical findings excludes the diagnosis of polymyositis ? \nSelect and explain. \nA. Neck muscle involvement, B. Extraocular muscle involvement, C. Dysphagia, D. Abdominal muscle involvement', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]