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
Water fluoridation depends upon: 
Select and explain. 
A. The temperature in that area, B. Body weight, C. Both, D. None
C: Both
Answer: C: Both 
Explanation: Water fluoridation depends on the temperature in that area and body weight.
Galagan formula for ﬂuoride: 
This is usually calculated by the formula given by Galagan and Vermillion in 1957.
Ppm of F ‾= - 0.038 +0.0062 t temperature in Fahrenheit.
‘E’ is the estimated daily water intake for children in ounces per pound of body weight.
‘t’ is the yearly mean of the daily maximum temperature in Fahrenheit.
Essentials of preventive and community dentistry 
Soben Peter 
5th edition