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
Commonest complication following haemorrhoidectomy is: 
Select and explain. 
A. Hemorrhage, B. Infection, C. Fecal impaction, D. Urinary retention
D: Urinary retention
Answer: D: Urinary retention 
Explanation: Complications of Hemorrhoidectomy Early complications Late complications Pain (MC) Acute retention of urine (2nd MC) Reactionary hemorrhage Secondary hemorrhage Anal stricture Anal fissure Incontinence