This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
The following are live attenuated vaccine, except- 
Select and explain. 
A. Oral poilio, B. Yellow fever, C. Measles, D. Influenza
A: Oral poilio
Answer: A: Oral poilio 
Explanation: oral polio vaccines were first introduced by Sabin in 1957.it contains live attenuated strains of virus type 1,2, and 3.grown in primary monkey kidney or h7man diploid cell cultureref;parks tectbook,ed22,pg 187