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': 'In tetanus infection: \nSelect and explain. \nA. The disease is produced by the endotoxin of bacillus tetani, B. The toxin travels along the nerves to CNS, C. A child under the age of one year has an inborn immunity, D. The spasm does not affect respiration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]