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
Commonly undergoing malignant transformation is/are :a) FAPb) Crohn' s diseasec) Ulcerative colitisd) Enteric colitise) Juvenile polyposis 
Select and explain. 
A. a, B. bc, C. ac, D. b
C: ac
Answer: C: ac 
Explanation: None