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
Strain of Japanese encephalitis vaccine is 
Select and explain. 
A. Jerryl lynn strain, B. Oka strain, C. Nakayama strain, D. 17D vaccine
C: Nakayama strain
Answer: C: Nakayama strain 
Explanation: Nakayama strain and beijing strain are strains of JE vaccine.