This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Seasonal trends is shown by- \nSelect and explain. \nA. Varicella, B. Polimyelitis, C. Malaria, D. Measles', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .seasonal trend is a well known characteristic of many communicable diseases such as varicella,cerebrospinal meningitis,upper respiratory infections,malaria etc.varicella is usually at its height in early spring and so is measles. ref:parks textbook ,22nd edition,pg no 62', 'role': 'assistant'}]