<prompt> In cancer colon investigation of choice is:CT scanBarium enemaColonoscopyX-ray  <response>: Ans. c ColonoscopyRef: Bailey and Love 27th edition, Page 1262 Investigation of choice for cancer colon is colonoscopy as we can take biopsy and confirm the lesion. Risk of perforation is 1:1000. Helps to detect synchronous lesions also. 