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
Determining level of fluoride in community water fluoridation programme depends on: 
Select and explain. 
A. Mean annual temperature of the place, B. Economic factors, C. Average weight of children of the area, D. Altitude of area above sea level
A: Mean annual temperature of the place
Answer: A: Mean annual temperature of the place 
Explanation: None