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 term prevalence refer to the 
Select and explain. 
A. Cumulative effect of a disease, B. Number of new cases of a disease, C. Proportion of population affected by a disease, D. Rate of disease
C: Proportion of population affected by a disease
Answer: C: Proportion of population affected by a disease 
Explanation: None