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: Dental
[{'content': 'Index ages for the survey are (OR) the age groups recommended in the national pathfinder survey are \nSelect and explain. \nA. 5, 15, 25, 35, 65 to 70 years, B. 5, 10,15,30,60 to 70 years, C. 5, 12, 15, 35 to 44 and 65 to 74 years, D. 5 to 10, 15 to 35, 40 to 65 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]