This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'Generator area in a nerve cell is \nSelect and explain. \nA. Cell body, B. Initial segment, C. Axon, D. Dendrites', 'role': 'user'}, {'content': "Answer: B \nExplanation: The first poion of the axon is called the initial segment. The Initial segment in spinal motor neurons, the initial node of Ranvier in cutaneous sensory neurons is a site where propagated action potentials are generated.(Ref: Ganong's Review of Medical Physiology Twenty-Third Edition)", 'role': 'assistant'}]