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 live attenuated vaccine: 
Select and explain. 
A. Salk polio vaccine, B. Sabin polio vaccine, C. Rabies vaccine, D. KFD vaccine
B: Sabin polio vaccine
Answer: B: Sabin polio vaccine 
Explanation: Ans. b. Sabin polio vaccine