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
True about marjolins ulcer is 
Select and explain. 
A. Ulcer over scar, B. Rapid growth, C. Rodent ulcer, D. Painful
A: Ulcer over scar
Answer: A: Ulcer over scar 
Explanation: None