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: Microbiology
[{'content': 'A full course of immunization against, Tetanus with 3 doses to Tetanus toxoid, confers immunity for how many years? \nSelect and explain. \nA. 5, B. 10, C. 15, D. 20', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]