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
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: Ans. is 'c' i.e., Explosive