This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
[{'content': 'In the demographic study of population, a country with low bih rate & a low death rate is in following phase \nSelect and explain. \nA. 1st phase, B. 2nd phase, C. 3rd phase, D. 4th phase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fouh stage of demographic cycle is low stationary Characterised by a low bih and low death rate with the result that the population becomes stationary Reference: Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 479', 'role': 'assistant'}]