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
[{'content': 'Not true regarding solitary rectal ulcer - \nSelect and explain. \nA. 20% are multiple, B. Recurrent rectal prolapse is a cause, C. Involves Posterior wall., D. Managed by digital reposition', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Causes of solitary rectal ulcer syndrome\nDue to a combination of\n\nInternal intussusception\nAnterior rectal wall prolapse\nIncrease in intrarectal pressure\n\nSymptoms\xa0→ pain, bleeding, mucus discharge or outlet obstruction.\nTreatment\n\nNonoperative therapy (high fibre diet, defecation training to avoid straining, and laxatives or enemas) is effective in the majority of patients.\nSurgery (either abdominal or perineal repair of prolapse) is reserved for highly symptomatic patients, who have failed all medical intervention e.g. rectopexy.', 'role': 'assistant'}]