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': 'All of the following are features of thyrotoxicosis, except- \nSelect and explain. \nA. Diastolic murmur, B. Soft non ejection systolic murmur, C. Irregularly, irregular pulse, D. Scratching sound in systole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]