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
[{'content': "True about tetanus is all except ? \nSelect and explain. \nA. 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 bihs", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Herd immunity present o There is no herd immunity in tetanus. o All other options are correct.", 'role': 'assistant'}]