This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
In cancer colon investigation of choice is: 
Select and explain. 
A. CT scan, B. Barium enema, C. Colonoscopy, D. X-ray
C: Colonoscopy
Answer: C: Colonoscopy 
Explanation: 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.