This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Stapler used for MIPH \nSelect and explain. \nA. Linear cutting stapler, B. Circular cutting stapler, C. Linear stapler, D. Circular stapler', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .. Stapled haemorrhoidopexy (Antonio Longo) is circumferential excision of the mucosa and submucosa 4 cm above the dentate line using circular haemorrhoidal stapler passed per anally (MIPH - Minimally Invasive Procedure for Haemorrhoids). Advantages are--It is less painful; less blood loss; faster recovery; sho hospital stay and equally efficacious. It is done only for prolapsed piles. Improper purse string can cause incomplete doughnut leading to severe haemorrhage. ref:SRB&;s manual of surgery,ed 3,pg no 910', 'role': 'assistant'}]