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: Medicine
The presence of anti-Saccharamyces cerevisae antibody is a surrogate marker of one of the following - 
Select and explain. 
A. Celiac disease, B. Crohn's disease, C. Ulcerative colitis, D. Tropical sprue
B: Crohn's disease
Answer: B: Crohn's disease 
Explanation: None