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
Seasonal trends is shown by- 
Select and explain. 
A. Varicella, B. Polimyelitis, C. Malaria, D. Measles
A: Varicella
Answer: A: Varicella 
Explanation: .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