This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pneumothorax, Subject name: Medicine
[{'content': 'What is the first line of management in tension pneumothorax? \nSelect and explain. \nA. CXR, B. Needle in 2nd intercostal space, C. Emergency thoracotomy, D. ICD tube in 5th intercostal space midaxillary line', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Emergency needle decompressionis carried out on the affected side by placing an 18-gauge needle into the hemithorax at the mid-clavicular line in the 2nd anterior intercostal space. This relieves the tension created within the thorax. It does not treat the pneumothorax; subsequent chest tube inseion is required. Tube thoracostomy (chest tube inseion) and underwater seal drainage are the mainstays of treatment for spontaneous pneumothorax.', 'role': 'assistant'}]