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 - \nSelect and explain. \nA. Develops in long standing scar, B. Sq cell Ca develops, C. Slow growing lesion, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans is 'a' i.e. Develops in long standing scar; 'b' i.e. sq cell Ca develops; 'c' i.e. Slow growing lesion Baghdad sore or oriental sore or Delhi boil is caused by Leishmania Tropica.", 'role': 'assistant'}]