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': 'Acute mechanical large bowel obstruction should be operated early because of the risk of ? \nSelect and explain. \nA. Respiratory embarrassment due to abdominal distension, B. Electrolyte imbalance from vomiting, C. Septicaemia from bowel contents, D. Closed-loop obstruction and caecal perforation', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. 'd' Closed-loop obstruction and cecal perforation", 'role': 'assistant'}]