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': "A patient comes with rectal carcinoma situated 6 cm above dentate line with no nodal metastasis. Treatment of choice will be: \nSelect and explain. \nA. Anterior resection, B. APR, C. Radiotherapy, D. Hamann's procedure", 'role': 'user'}, {'content': 'Answer: A \nExplanation: "In this patient the tumor lies 6 cms above the dentate line (the lower limit is taken into consideration). So the adequate margin is available for a colorectal anastomosis, hence a LAR procedure can be done" Ref: Sabiston 18/e, Page 1413; Schwaz 9/e, Page 1028; CSDT 13/e, Page 664; Devita\'s Oncology 8/e, Page Chapter 3, Section 13.', 'role': 'assistant'}]