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': 'Section of the vagus nerve results in \nSelect and explain. \nA. Increased rate of respiration, B. Decreased depth of respiration, C. Irregular breathing patterns, D. Increases in breath - holding time', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Vagus nerve causes contraction of bronchial muscle helping in expiration. Section of vagus nerve leads to difficulty in expiration and therefore increasing breath holding time. Ref: Ganong&;s review of medical physiology; 23rd edition; pg: 267; table 17-1.', 'role': 'assistant'}]