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
Which of the following is characteristic of a single exposure common vehicle outbreak? 
Select and explain. 
A. Frequent secondary cases, B. Severity increases with increasing age, C. Explosive, D. Cases occur continuously beyond the longest incubation period
C: Explosive
Answer: C: Explosive 
Explanation: Main features The epidemic curve rises and falls rapidly with no secondary waves The epidemic trend tends to be explosive All cases develop within one incubation period (refer pg no:64 park 23rd edition)