This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
An emerging viral pathogen causing pyelonephritis in kidney allografts is- 
Select and explain. 
A. Molluscom contagiosum, B. Herpes simplex virus, C. Polyoma virus, D. Influenza virus
C: Polyoma virus
Answer: C: Polyoma virus 
Explanation: polyoma virus cmain multiplication site is brain&renal celld.this virus is seen in urine of the patient who had undergone kidney transplant REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.554