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
[{'content': 'Which of the following is associated with nasopharyngeal cancer? \nSelect and explain. \nA. HHV 1, B. HHV 2, C. HHV 3, D. HHV 4', 'role': 'user'}, {'content': 'Answer: D \nExplanation: HHV 4 or Epstein Barr virus can cause nasopharyngeal carcinoma.', 'role': 'assistant'}]