Progressive multifocal leukoencephaloPathy is caused-: (A) Epstein-barr virus, (B) Varicella-zoster virus, (C) Cytomegalo Virus, (D) JC Papovavirus
Answer is D. Harrison's principles of internal medicine. *In PML oligodendrocytes have enlarged densely staining nuclei that contain viral inclusions formed by crystallinearrays of JC virus paicles.