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: Physiology
[{'content': 'True statement regarding purkinje fibres:September 2009, March 2013 \nSelect and explain. \nA. Are myelinated fibres, B. Have action potential about a tenth as long as those in the hea muscle, C. Have conduction velocity of four times than that of the hea muscle, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Have conduction velocity of four times than that of the hea muscleConduction rate is 4 m/s in purkinje fibers whereas it is 1 m/s in ventricular muscles, atrial pathways and Bundle of His. SA Node and AV Node has a conduction speed of 0.05 m/s', 'role': 'assistant'}]