This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Kidney Disease & Diabetic Nephropathy, Subject name: Medicine
Which of the following is not an oppounistic infection in renal transplant patients in early (1-6 month) period? 
Select and explain. 
A. CMV, B. Hepatitis B, C. Polyoma virus, D. Hepatitis C
C: Polyoma virus
Answer: C: Polyoma virus 
Explanation: Oppounistic infection in renal transplantation < 1 Month Surgical site infection (SSI) with MRSA 1-6 month Pneumocystis jiroveci Cytomegalovirus (CMV) Hep B and C > 6 month Aspergillus Nocardia Bk virus (polyoma virus)