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': 'Biphasic action potential of mixed nerve except? \nSelect and explain. \nA. All or none phenomenon, B. Two or more positive peaks, C. Refractory period, D. Recorded on surface', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., Two or more positive peaksAction potential when recorded by putting two electrodes on the surface of a neuron (instead of putting on surface and one intracellularly), shows a biphasic response, i.e. Biphasic action potential.As the wave of depolarization reached the first electrode, this electrode becomes negative and an upward deflection (Peak) is recorded.", 'role': 'assistant'}]