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
Not included in numerator of dependency ratio? 
Select and explain. 
A. 5 years age group, B. 10 years age group, C. 20 years age group, D. 70 years age group
C: 20 years age group
Answer: C: 20 years age group 
Explanation: Ans. is 'c' i.e., 20 years age group