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': 'Fine, irregular contraction of individual fibers is called: \nSelect and explain. \nA. Fasciculations, B. Fibrillation, C. Tics, D. Spasm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fine,\xa0irregular\xa0contractions\xa0of\xa0individual fibers is known\xa0as fibrillations. This is the classic picture of a lower motor neuron lesion. If the motor nerve regenerates, the fibrillations\xa0disappear.\xa0 Usually,\xa0 the\xa0contractions are not visible grossly, and they should not be confused with fasciculations, which are jerky, visible contractions of groups of muscle fibers that occur as a result of pathologic discharge of spinal motor neurons.', 'role': 'assistant'}]