This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant Viral Diseases in Children, Subject name: Pediatrics
[{'content': 'Roseola infantum is caused by (most commonly)- \nSelect and explain. \nA. HHV - 2, B. HHV - 6, C. HHV - 7, D. HHV - 8', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Roseola infantum is caused most commonly by HHV - 6 less commonly by HHV - 7 C/F: fever 3-4 days + Rash (maculopapular) appear after cessation of fever', 'role': 'assistant'}]