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: Social & Preventive Medicine
True about tetanus is all except - 
Select and explain. 
A. Tetanus protection 5 years if previously immunized, B. Herd immunity present, C. Can't be eradicated, D. Elimination is less than 1 case per 1000 births
B: Herd immunity present
Answer: B: Herd immunity present 
Explanation: None