Which is false about Crohn's disease?

Crohn's disease (CD) can invade any pa of GIT from the oral cavity to the anus. Studies show that 70% of patients with CD will require a bowel resection in the first decade after diagnosis and 40% will require a fuher resection * Since surgery does not cure CD, the fundamental principle is to preserve healthy gut and to maintain adequate function. As the disease might recur after the surgery. Surgery is palliative in Crohn's disease whereas curative in Ulcerative colitis (UC). In UC disease stas from rectum and the fuher proceeds to the colon. Hence a single proctocolectomy is performed which is curative.