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: Surgery
Skip lesions are seen in 
Select and explain. 
A. Ulcerative colitis, B. Crohn's disease, C. Typhoid, D. Tuberculosis
B: Crohn's disease
Answer: B: Crohn's disease 
Explanation: in ileocaecal tuberculosis,.Ulcerative--commonest 60%. Circumferential transverse often multiple 'girdle' ulcers - with skip lesions. It i common in old, malnourished people. skip lesions are typical in the case of crohn&;s diseaseskip lesions are also observed in wet gangrene and necrotizing enterocolitis . ref:SRB&;s manual of surgery,ed 3,pg no 513