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: Dental
Pityriasis rosea  is caused by 
Select and explain. 
A. Autoimmune etiology, B. HHV 3 & 4, C. HHV 4 & 5, D. HHV 6 & 7
D: HHV 6 & 7
Answer: D: HHV 6 & 7 
Explanation: Pitryiasis rosea is caused by HHV 7 > HHV 6