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': "A 3-year-old child presents at the physician's office with symptoms of coryza, conjunctivitis, low-grade fever, and Koplik's spots. The causative agent of this disease belongs to which group of viruses? \nSelect and explain. \nA. image_question, B. image_question, C. image_question, D. image_question", 'role': 'user'}, {'content': "Answer: B \nExplanation: Koplik's spots are pathognomonic for measles. The measles virus is a paramyxovirus. In industrialized countries, vaccination has reduced the impoance of this childhood infection (although U.S. incidence increased in 1989 and 1990). In developing countries, however, measles is a major killer of young children. In America, most states now require proof of immunity before school enrollment, and this has reduced the incidence of disease Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition", 'role': 'assistant'}]