This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Principles of Immunization and Vaccination, Subject name: Social & Preventive Medicine
[{'content': 'Killed vaccine is - \nSelect and explain. \nA. Hepatitis A, B. Measles, C. OPV, D. BCG', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Hepatitis A o Hepatitis A vaccines are of both typesFormaldehyde inactivated vaccines (killed vaccines)Live attenuated vaccineso All other options are live vaccines,Live'attenuated' vaccinesKilled 'inactivated' vaccinesBCGPertussisOPV (Sabin - Oral polio vaccine)IPV (Salk - Inactivated polio vaccine)Measles vaccineRabies vaccineMumps vaccineCholera vaccineRubella vaccineMeningococcal vaccineYellow fever vaccineHepatitis B vaccineTyphoralTyphim - Vi vaccineHepatitis - AHepatitis - A", 'role': 'assistant'}]