In a 27-year-old male, most common cause of a colovesical fistula would be:

Ans. (a) Crohn's diseaseRef: Sabiston 19th edition, Pages 1247, 1313* Young male most common cause of colovesical fistula: CD* Old age most common cause of colovesical fistula: Diverticular disease* Overall most common cause is diverticulitis