An elderly male presents 2 months after renal trans-planatation with nephropathy. Which of the following can be a viral etiological agent?

Answer- A. Polymoa virus BK Polyoma BK Virus:BK virus is Polyoma virus associated with nephropathy, typically after l-4 moths after transplant.High levels of BK virus replication detected by PCR in urine and blood are predictive of pathology. especially in setting of renal transplantation.Urinary excretion of BK virus and BK virusemia are associated with the development of ureteric strictures, Polyoma virus associated nephropathy.