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': 'A community survey shows crude birth rate 23, and crude death rate 6. The demographic stage of population is - \nSelect and explain. \nA. High stationary, B. Early expanding, C. Late expanding, D. Low stationary', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Growth rate = Crude birth rate - Crude death rate\n\xa0Relationship between growth rate and population', 'role': 'assistant'}]