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': 'A twitch of motor unit is called: \nSelect and explain. \nA. Myoclonic jerk, B. Tremor, C. Fasciculation, D. Chorea', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fasciculations are jerky, visible\xa0contractions of groups of muscle fibers that occur as a result\xa0of pathologic discharge of spinal motor neurons.\nReference: Ganong’s Review of Medical Physiology 25 Ed page no 110\u200b', 'role': 'assistant'}]