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': 'Carrier state is not seen in which infection: September 2010 \nSelect and explain. \nA. Tetanus, B. Ameobiasis, C. Peussis, D. Diphtheria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Tetanus', 'role': 'assistant'}]