This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
[{'content': 'One of the following statement about tetanus is true: \nSelect and explain. \nA. Caused by C. Tetani, B. Anaerobic infection, C. Central spores, D. Cannot be prevented', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a', 'role': 'assistant'}]