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: Pediatrics
[{'content': 'True about tetanus – \nSelect and explain. \nA. Tetanus bacilli can spread through blood, B. Spread along the nerves only, C. Requires oxygen, D. I.P. is variable', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pathogenicity \n\nCl. tetani has little invasive property and is confined to the primary site of lodgment. Tetanus results from the action of the potent exotoxin it produces.\nToxin is released in the wound, it enters the axon of neurons and is transported to brain stern and spinal cord by regrograde intraneural transport where it presynaptically blocks release of glycine and GABA.\n\nTetanus \n\nIncubation period - is variable from two days to several weeks, but is commonly 6-12 days. Note : It is tetanus toxin not bacilli that spread along the nerve.', 'role': 'assistant'}]