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: Surgery
[{'content': 'Best treatment of tension pneumothorax is - \nSelect and explain. \nA. Immediate letting out of air, B. Wait and watch, C. Rib resection, D. Underwater drainage', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Immediate letting out of air Tension pneumothorax must be treated as a medical emergency. If the tension in the pleural space is not relieved, the patient is likely to die from inadequate cardiac output or marked hypoxemia. A large-bore needle should be inseed into the pleural space through the second anterior intercostal space. If large amounts of gas escape from the needle after inseion, the diagnosis is confirmed. The needle should be left in place until a thoracostomy tube can be inseed.", 'role': 'assistant'}]