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': 'The node of Ranvier is seen in \nSelect and explain. \nA. Cell body, B. Axons, C. Dendrites, D. Terminalbutons', 'role': 'user'}, {'content': "Answer: B \nExplanation: Nodes of Ranvier are periodic gaps in the myelin sheath on the axon.\nA neuron is a functional unit (the basic unit of nervous tissue).\nIt is specialized for the function of reception, integration and transmission of information in the body,\nThe basic structure of the neuron is best studied in a spinal motor neuron,\nThis cell has a ‘cell body (soma)' with 5-7 small processes called ‘dendrites'.\nThere is a long process called ‘axon’ that originate from “axon hillock (A thickened area of cell body from which axon originates)”.\nThe first portion of the axon is called “initial segment”.\nIn a motor neuron, the axon hillock and the initial segment of axon have the lowest threshold for excitation", 'role': 'assistant'}]