This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rectum and anal canal, Subject name: Surgery
[{'content': 'Commonest complication following haemorrhoidectomy is: \nSelect and explain. \nA. Hemorrhage, B. Infection, C. Fecal impaction, D. Urinary retention', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Complications of Hemorrhoidectomy Early complications Late complications Pain (MC) Acute retention of urine (2nd MC) Reactionary hemorrhage Secondary hemorrhage Anal stricture Anal fissure Incontinence', 'role': 'assistant'}]