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
Premalignant conditions of the skin include - 
Select and explain. 
A. Bowen disease, B. Paget' s disease of nipple, C. Leukoplakia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is `d' i.e., All of the above