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': 'Which of the following age group comprises the young age dependant population? \nSelect and explain. \nA. <10 years, B. <12 years, C. < 15 years, D. < 18 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Children below 15 years and elderly above 65 years comprise the dependent population. Young age dependency is children below 15 years and old age dependency is above 65 years. Ref: Park 21st edition, page 447.', 'role': 'assistant'}]