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
The number of new cases of a specific disease occurring in a defined population during a specified period of time is known as 
Select and explain. 
A. Incidence, B. Point prevalence, C. Distribution, D. Prevalence
A: Incidence
Answer: A: Incidence 
Explanation: None