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
Denominator of dependency ratio includes population of age 
Select and explain. 
A. >15 years + > 65 years, B. 15 - 65 years of age, C. < 65 years, D. > 65 years
B: 15 - 65 years of age
Answer: B: 15 - 65 years of age 
Explanation: None