This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Cyclic trend is shown by ? 
Select and explain. 
A. Polio epidemic, B. Rabies, C. Influenza pandemic, D. Malaria
C: Influenza pandemic
Answer: C: Influenza pandemic 
Explanation: Ans. is 'c' i.e., Influenza pandemic