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': 'Normal AV delay of 0.1 seconds is due to \nSelect and explain. \nA. Decrease in amplitude of firing, B. Resistance offered by myocytes, C. Decrease in number of gap junctions, D. Lack of tight junctions', 'role': 'user'}, {'content': 'Answer: C \nExplanation: AV nodal fibers are small and have lesser gap junctions. This leads to AV nodal delay and slower conduction speed.', 'role': 'assistant'}]