Child presents with rapidly worsening altered mental status, nausea/vomiting, and then has a seizure. His LFTs are all markedly elevated. He just recovered from chickenpox a week ago. What is the diagnosis?

a) Reye syndrome; Supportive care
b) Acute liver failure; Liver transplant
c) Encephalitis; Antiviral therapy
d) Guillain-Barré syndrome; IV immunoglobulin