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': 'Decompression of tension pneumothorax using a needle would be done under which step of ABCDE of trauma care \nSelect and explain. \nA. A, B. B, C. C, D. D', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acute tension pneumothorax, flail chest with contusion, massive haemothorax and open pneumothorax are examples of life-threatening injuries that must be identified in the primary survey, i.e. they are not radiological diagnosis. Treat pneumothorax, haemothorax and tension pneumothorax with a tube thoracostomy. As an emergency measure in tension pneumothorax, immediately decompress with the insertion of a needle into the pleural space in the mid-clavicular line two finger.', 'role': 'assistant'}]