This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rectum, Subject name: Surgery
[{'content': 'Internal sphincterotomy is the treatment of choice for: \nSelect and explain. \nA. Piles, B. Fissure in ano, C. Fistula, D. Carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Fissure in anoRef: Bailey 26th edition Page 1248* Lateral sphincterotomy of Notaras is done for fissure in ano.* Internal sphincter is laterally cut.', 'role': 'assistant'}]