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: Microbiology
Which of the following is a killed vaccine - 
Select and explain. 
A. Hepatitis B, B. Measles, C. Yellow fever, D. Japenese encephalitis
D: Japenese encephalitis
Answer: D: Japenese encephalitis 
Explanation: None