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
Surgery for fissure in ano is 
Select and explain. 
A. Seton’s procedure, B. Lateral spincterectomy, C. Well’s procedure, D. Winter’s procedure
B: Lateral spincterectomy
Answer: B: Lateral spincterectomy 
Explanation: Lateral spincterectomy is done for pts of fissure in ano whom medical treatment fails.