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
Internal sphincterotomy is the treatment of choice for: 
Select and explain. 
A. Piles, B. Fissure in ano, C. Fistula, D. Carcinoma
B: Fissure in ano
Answer: B: Fissure in ano 
Explanation: 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.