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': 'General fertility rate - \nSelect and explain. \nA. Indicator of complete family size, B. Measure of fertility, C. Not bether than crude birth rate, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: GFR is a better measure of fertility than the crude birth rate.\nCompleted family size is indicated by total fertility rate (not GFR).', 'role': 'assistant'}]