This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': 'A person had an accident and came to casualty with contusion on left precordium. There was decrease in breath sounds on left side, trachea deviated to right side and normal heart sounds. Which of the following is the first line of management? \nSelect and explain. \nA. Needle thoracocentesis, B. Chest tube thoracocentesis, C. Pericardiocentesis, D. Open surgery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Needle Thoracocentesis* History is clearly indicative of Tension Pneumothorax- hence urgent need is Thoracocentesis at 2nd ICS. MCL.', 'role': 'assistant'}]