This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Normal QT interval is (in seconds) \nSelect and explain. \nA. 0.12 - 0.20, B. 0.40 - 0.43, C. 0.08 - 0.10, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: QT interval 0.40 to 0.43Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:494", 'role': 'assistant'}]