This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anal Fissures, Subject name: Surgery
[{'content': 'Seton used in fistula in anosurgery is draining seton and - \nSelect and explain. \nA. Cutting seton, B. Dissolvingseton, C. Dissectingseton, D. Fibrosing seton', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Cutting seton Types of setonsCutting setonSilk/prolene/monofilament nylon.Invented by hippocretes.Aka 'tight seton'Gradually/slowly cuts through the sphincter muscle - which is replaced by fibrosis.Draining setonAka loose setonUsually a rubber sling.Purpose is drainage of collected pus.", 'role': 'assistant'}]