This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Incubation period of rubella is - \nSelect and explain. \nA. 18-72 hours, B. 2-3 weeks, C. 1-3 months, D. >1 year', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The incubation period of rubella is 2-3weeks REF:<\\p> ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.555', 'role': 'assistant'}]