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: Medicine
All of the following are true regarding progressive multifocal leukoencephalopathy except -a) Only manifestation of JC virus infectionb) Late manifestation of AIDSc) Cerebellar involvements is unknownd) Paradoxical worsening with anti-retroviral therapy 
Select and explain. 
A. ab, B. bc, C. bd, D. cd
D: cd
Answer: D: cd 
Explanation: None