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': 'Highest rate of impulse generation is given in: \nSelect and explain. \nA. SA node, B. AV node, C. Bundle of HIS, D. Purkinje system', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (SA Node) The rate of impulse generation/rate of discharge is highest in the SA node. Note: Highest Rate of impulse generation in seen in : SA NodeQ Highest Rate of conduction is seen in : Purkinje SystemQ', 'role': 'assistant'}]