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 basic tools of measurement in epidemiology are 
Select and explain. 
A. Incidence, prevalence and index, B. Morbidity, mortality and disability, C. Rates, ratios and proportions, D. Endemic, pandemic and epidemic
C: Rates, ratios and proportions
Answer: C: Rates, ratios and proportions 
Explanation: None