This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Yellowish exudates at multiple sites seen in colonoscopy indicates - 
Select and explain. 
A. Crohn's disease, B. Hirschsprung disease, C. Tuberculosis, D. Lymphoma
A: Crohn's disease
Answer: A: Crohn's disease 
Explanation: In Crohn's disease focal inflammation and ulceration are frequently seen.
In ulcerative colitis usually hyperemia is seen.