This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant facts in Immunization, Newer Vaccines, Subject name: Social & Preventive Medicine
[{'content': 'Neomycin is used in which of the following vaccines to prevent bacterial contamination? \nSelect and explain. \nA. OPV and BCG, B. MMR and IPV, C. DPT and HPV, D. Hib and HPV', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MMR vaccine and IPV each contains less than 25 mg of neomycin per dose . Persons who are known to be allergic to neomycin should be closely observed after vaccination so that any allergic reaction can be treated at once.', 'role': 'assistant'}]