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: Pathology
[{'content': 'Which of the following is cariogenic? \nSelect and explain. \nA. Selenium, B. Vanadium, C. Strontium, D. Molybdenum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]