This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Which one is not the pre cancerous condition 
Select and explain. 
A. Crohn's disease, B. Ulcerative colitis, C. Leukoplakia, D. Xeroderma pigmentosum
A: Crohn's disease
Answer: A: Crohn's disease 
Explanation: Ideal answer to this question is none but in the given situation.the answer of choice is crohn of inflammatory bowel disease , crohn disease is less likely to be associated with profession to cancer of the bowel ref Robbins 9/e p279