This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Which among the following is a killed vaccine 
Select and explain. 
A. Japanese encephalitis, B. Measles, C. Influenza vaccine, D. Yellow fever
A: Japanese encephalitis
Answer: A: Japanese encephalitis 
Explanation: Japanese encephalitis vaccine is a killed vaccine Killed vaccines are produced by growing virus or bacteria in a culture media and then inactivating them with heat or chemicals They are usually safe but less efficacious than live attenuated vaccines. Measles, yellow fever and influenza vaccines are live attenuated vaccines Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition