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
[{'content': "Following the immunotherapy, in patients undergoing renal transplantation, the skin cancer most commonly seen is - \nSelect and explain. \nA. Skin tumors, B. Kaposi's sarcoma, C. Hepatomas, D. Mycosis fungoides", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]