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: Pathology
What is the causative agent of kaposi sarcoma 
Select and explain. 
A. HBV, B. HCV, C. HHV, D. HSV
C: HHV
Answer: C: HHV 
Explanation: HHV - 8 (Human Herpesvirus 8) is the causative agent of kaposi sarcoma.