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': 'Why does initiation of nerve impulse occurs at the axon hillock? \nSelect and explain. \nA. It is unmyelinated, B. Due to the release of neurotransmitter, C. It has a lower threshold than the rest of the axon, D. None of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: In motor neurons, the poion of the cell with the lowest threshold for the production of a full fledged action potential is the initial segment, the poion of the axon at and just beyond the axon hillock. Ref: Ganong's Review of Medical Physiology, 23rd Edition, Chapter 4.", 'role': 'assistant'}]