This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant Bacterial Diseases in Children, Subject name: Pediatrics
True about tetanus are all EXCEPT? 
Select and explain. 
A. Tetanus bacilli cannot spread through blood, B. Spread along the nerves, C. Requires oxygen, D. Incubation period is variable
C: Requires oxygen
Answer: C: Requires oxygen 
Explanation: Option a True Tetanus bacillus is not an invasive organism Option b True Tetanus toxin binds at neuromuscular junction & enters motor nerve by endocytosis, after which it undergoes retrograde axonal transpo to cytoplasm of neuron Option c False Clostridium tetani, is a motile, Gram-positive, spore-forming obligate anaerobe Option d True The incubation period of tetanus is typically is 2-14 days but may be as long as months after the injury.