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': "True about treatment of carcinoma left colon with acute obstruction \nSelect and explain. \nA. Haman's procedure, B. Left colectomy with anastomosis, C. Proximal colostomy, D. All", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is ' a ' , ' b ' , ' c '", 'role': 'assistant'}]