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': 'Ampicillin prophylaxis is given in ? \nSelect and explain. \nA. Rectal surgery, B. Splenectomy, C. Head and neck surgery, D. Biliary surgery', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Rectal", 'role': 'assistant'}]