This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Surgery
[{'content': 'Kaposi sarcoma is caused by: \nSelect and explain. \nA. HHV 17, B. HHV 8, C. HPV 16, D. Human simian virus 40', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Kaposi sarcoma is caused by HHV 8.', 'role': 'assistant'}]