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
[{'content': 'Not included in numerator of dependency ratio? \nSelect and explain. \nA. 5 years age group, B. 10 years age group, C. 20 years age group, D. 70 years age group', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 20 years age group", 'role': 'assistant'}]