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
Young’s formula for calculating pediatric dose of a drug is: 
Select and explain. 
A. Age / Age+12 x Adult dose, B. Age / 20 x Adult dose, C. Weight (pounds) / 150 x Adult dose, D. None of the above
A: Age / Age+12 x Adult dose
Answer: A: Age / Age+12 x Adult dose 
Explanation: Remember, the age denoted here is chronological age.
Option 1 is Young’s formula to calculate pediatric dose.
Option 2 is Dilling's rule to calculate pediatric dose.
Option 3 is Clark's rule to calculate pediatric dose.