This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'Speed of conduction is fastest in- \nSelect and explain. \nA. AV node, B. SA node, C. Bundle of His, D. Purkinje system', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Purkinje system Cardiac tissueConduction velocity (meter/second)SA node0 [?] 05Inteatrial pathways1Atrial muscle0 [?] 30AV node0 [?] 05 (minimum)Bundle of His1Purkinje system4 (maximum)Ventricular muscle1", 'role': 'assistant'}]