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 DPT vaccine ? \nSelect and explain. \nA. > 95% Efficacy, B. Prevent development of carrier, C. Prevent development of Diphtheria, D. Stored at -4deg C', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Prevent development of carrier Diphtheria toxoid (in DPT) prevents development of disease by inducing antibody formation against diphtheria toxin (exotoxin) which is responsible for disease. But, it does not prevent carrier state as antibodies are not produced against organism and it can reside in nasopharynx.", 'role': 'assistant'}]