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: Dental
Not true about propagated epidemics 
Select and explain. 
A. Herd immunity present, B. Sharp rise and decrease sharply, C. Person to person transmission, D. Multiple waves of epidemic
B: Sharp rise and decrease sharply
Answer: B: Sharp rise and decrease sharply 
Explanation: None