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: • Virtually all patients with complete acute large bowel obstruction require prompt surgical intervention and should not undergo a trial of non-operative management\n• Acute large bowel obstruction in patients with competent ileocecal valve is a true surgical emergency because of high chances of perforation (MC site: Cecum)\xa0\n• Once diagnosis has been made, surgical exploration should be undertaken as soon as possible after appropriate resuscitation', 'role': 'assistant'}]