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': 'Milligan-Morgan operation is indicated in \nSelect and explain. \nA. Rectal prolapse, B. Haemorrhoides, C. Anal fissure, D. Fistula in Ano', 'role': 'user'}, {'content': "Answer: B \nExplanation: (Haemorrhoids) (1259-LB) (1256-B &L 25th)Indication of Haemorrhoidectomy* Third degree haemorrhoids* Second degree haemorrhoids which have not been cured by non operative treatments* Fibrosed haemorrhoids* Intero-extemal haemorrhoids when the external haemorrhoids is well definedHaemorrhoidectomy can be performed using an open or closed technique - Open technique is most commonly used in the UK and is known as the Milligan-Morgan operation. In the open technique the anal mucosa and skin are left open to heal by secondary intension, and in the closed technique the wound is sutured.* Delorme's operation used in rectal prolapse (1225-LB)", 'role': 'assistant'}]