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
[{'content': 'Strain of Japanese encephalitis vaccine is \nSelect and explain. \nA. Jerryl lynn strain, B. Oka strain, C. Nakayama strain, D. 17D vaccine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nakayama strain and beijing strain are strains of JE vaccine.', 'role': 'assistant'}]