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
[{'content': 'True about marjolins ulcer is - \nSelect and explain. \nA. Ulcer over scar, B. Rapid growth, C. Rodent ulcer, D. Painful', 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is 'a' i.e. Ulcer over scar", 'role': 'assistant'}]