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': 'The most favoured treatment for a pelvic abscess in cul-de-sac is - \nSelect and explain. \nA. Laparotomy, B. Colpotomy, C. External I & D, D. Antibiotics', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]