This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Medicine
What is the diagnosis of following barium studies film? 
Select and explain. 
A. Toxic megacolon, B. Chron's disease, C. Intestinal perforation, D. Intussusception
B: Chron's disease
Answer: B: Chron's disease 
Explanation: Ans. B. Chron's diseaseBarium follow-through showing terminal ileal Crohn's disease. A long stricture is present (arrow A), and more proximally there is ulceration with characteristic 'rose thorn' ulcers (arrow B).Radiological features of chron's diseases.a. Thickened folds.b. Aphthous ulcer.c. Cobble stoning of small intestine.d. Stricture, fistula in advanced disease.e. 'String sign' represents long areas of circumferential inflammation and fibrosis.f. CT findings include mural thickening >2cm, perianal disease and adenopathy.