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': 'Tonsillar carcinoma is associated with infection of: \nSelect and explain. \nA. HIV, B. HPV, C. HSV, D. None of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: HPV is an epitheliotropic virus that has been detected to varying degrees within samples of oral cavity squamous cell carcinoma. Infection alone is not considered sufficient for malignant conversion; however, results of multiple studies suggest a role of HPV in a subset of head and neck squamous cell carcinoma. Approximately 40% of tonsillar carcinomas demonstrate evidence of HPV types 16 and 18. Ref: Schwaz's principle of surgery 9th edition, chapter 18.", 'role': 'assistant'}]