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: Surgery
Which of the following is associated with nasopharyngeal cancer? 
Select and explain. 
A. HHV 1, B. HHV 2, C. HHV 3, D. HHV 4
D: HHV 4
Answer: D: HHV 4 
Explanation: HHV 4 or Epstein Barr virus can cause nasopharyngeal carcinoma.