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
Which of the following is not a precancerous condition to colon - 
Select and explain. 
A. Irritable bowel syndrome, B. Ulcerative colitis, C. Familial polyposis, D. All
A: Irritable bowel syndrome
Answer: A: Irritable bowel syndrome 
Explanation: None