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: Surgery
Inflammatory bowel disease found in children :a) Ulcerative colitisb) Tropical spruec) Crohn's diseased) Celiac diseasee) Cystic fibrosis 
Select and explain. 
A. ac, B. a, C. ad, D. bc
A: ac
Answer: A: ac 
Explanation: None