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
After renal transplant the commonest malignancy is ? 
Select and explain. 
A. Lymphoma, B. Renal cell ca, C. Skin cancer, D. Adrenal cancer
C: Skin cancer
Answer: C: Skin cancer 
Explanation: Ans is 'c' ie skin cancer Immunosuppressed patients are more likely to develop cancer than age-matched subjects in the general population. Among several thousand tumors that occurred in renal transplant recipients before 1995, the common cancers, in order, were skin cancer, lymphoma, Kaposi's sarcoma, carcinomas of cervix, renal tumors, and carcinomas of the vulva and perineum." - Cambell's Urology