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: Medicine
[{'content': 'After undergoing a left pneumonectomy, a female patient has a chest tube in place for drainage. When caring for this patient, the nurse must \nSelect and explain. \nA. Monitor fluctuations in the water-seal chamber, B. Clamp the chest tube once every shift, C. Encourage coughing and deep breathing, D. Milk the chest tube every 2 hours', 'role': 'user'}, {'content': 'Answer: C \nExplanation: When caring for a patient who is recovering from a pneumonectomy,\xa0the nurse should encourage coughing and deep breathing to prevent pneumonia in the unaffected lung.\n\nBecause the lung has been removed, the water-seal chamber should display no fluctuations. \nReinflation is not the purpose of a chest tube.\nChest tube milking is controversial and should be done only to remove blood clots that obstruct the flow of drainage.', 'role': 'assistant'}]