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 - \nSelect and explain. \nA. Electrolyte imbalance due to third space loss, B. Septicaemia from absorption of bowel contents, C. Early gangrene and perforation, D. Respiratory embarrassment to massive abdminal distension', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]