<prompt> Following genetic counseling in a family for Familial polyposis coli for a 15 year old person, APC gene mutation is present. Next step of screening iscolonoscopy from nowColonoscopy from 10 years before the detection of Ca. In familyOccult blood in stools every year till 30 years.CECT colonoscopy  <response>: If APC gene mutation is present colonoscopy done from 10 years of age. 