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
In a community, an increase in new cases denotes: 
Select and explain. 
A. Increase in incidence rate, B. Increase in prevalence rate, C. Decrease in incidence rate, D. Decrease in prevalence rate
A: Increase in incidence rate
Answer: A: Increase in incidence rate 
Explanation: Incidence is defined as, "the number of new cases occurring in a defined population during a specified period of time". Incidence measures the rate at which new cases occur in a community. Ref:Parks Textbook of Preventive and Social Medicine By K.Park, 18th Edition, Page 55