This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'In the immediate postoperative period, the common cause of respiratory insufficiency could be because of the following except: \nSelect and explain. \nA. Residual effect of muscle relaxant, B. Overdose of narcotic analgesic, C. Mild hypovolemia, D. Myocardial infarction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Mild hypovolemia(Ref: Bailey 26/e p15)Immediate post op Dyspnea:* MI* Heart failure* Pulmonary embolism* Exacerbation of COPD/asthma', 'role': 'assistant'}]