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
Following the immunotherapy, in patients undergoing renal transplantation, the skin cancer most commonly seen is - 
Select and explain. 
A. Skin tumors, B. Kaposi's sarcoma, C. Hepatomas, D. Mycosis fungoides
A: Skin tumors
Answer: A: Skin tumors 
Explanation: None