This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Factors that have been associated with an increased incidence of head and neck carcinomas include all of the following except \nSelect and explain. \nA. Syphilis, B. Hepatitis B virus, C. Exposure to nickel, D. Alcohol consumption', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]