This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Rubella virus was isolated in- \nSelect and explain. \nA. 1862, B. 1912, C. 1932, D. 1962', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Rubella virus was isolated in 1962. In 1967, an attenuated vaccine was developed. Ref:PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page: 150', 'role': 'assistant'}]