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
All of the following conditions are premalignant except - 
Select and explain. 
A. Ulcerative colitis, B. Crohn's disease, C. Bronchiectasis, D. Paget disease of bone
C: Bronchiectasis
Answer: C: Bronchiectasis 
Explanation: None