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': 'Old age dependent population includes population above the age of: \nSelect and explain. \nA. 53 years, B. 55 years, C. 65 years, D. 68 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The population with age more than 65 years is considered to be dependent on the economically productive age group and is considered to be the old age dependent population. Ref: Park, 22nd edition pg: 444', 'role': 'assistant'}]