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': 'Rate of impulse generation is maximum in \nSelect and explain. \nA. SA node, B. AV node, C. Bundle of His, D. Purkinje system', 'role': 'user'}, {'content': "Answer: A \nExplanation: SA node is located at the junction of the superior vena cava with the right atriumEven though Av node Bundle can produce impulse rate of impulse production is higher in SA nodeRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:490", 'role': 'assistant'}]