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: Pathology
Yellowish exudates at multiple sites seen in colonoscopy indicates:(2003) 
Select and explain. 
A. Crohn's disease, B. Hirshprung disease, C. Tuberculosis, D. Lymphoma
A: Crohn's disease
Answer: A: Crohn's disease 
Explanation: Ans: a (Crohn's)Ref: Harrison, 16thed, p. 1779 & 15thed, p. 1682* In Crohn's disease focal inflammation and ulceration are frequently seen.* In ulcerative colitis usually hyperemia is seen. Note that crypt abcesses are microscopic features.