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
Annual blood smear examination rate is an indicator of- 
Select and explain. 
A. Disease rate (Prevalence), B. Operational efficiency, C. % of transmission of malaria, D. Infectivity rate
B: Operational efficiency
Answer: B: Operational efficiency 
Explanation: None