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': 'Most common complication of central venous line is catheterisation is \nSelect and explain. \nA. Air embolism, B. Pneumothorax, C. Catheter related sepsis, D. Injury to artery veins', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Central Venous Catheterisation:\nMost common complication - Catheter related sepsis\xa0\nMost dangerous complication - Pneumothorax', 'role': 'assistant'}]