This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Strain used in Mumps vaccine \nSelect and explain. \nA. Oka, B. Jeryl Lynn, C. Danish 1331, D. Edmonston Zagreb', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Strains in Mumps Jeryll Lynn strain RIT 4385 Leningrad 3 strain L-Zagren strain Urabe strain Rubini strain Strains in Measles Edmonston-Zagreb strain Schwatz strain Moraten strain', 'role': 'assistant'}]