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': 'Population growth is said to be explosive when growth rate is \nSelect and explain. \nA. < 0.5, B. 0.5 - 1, C. 1 - 1.5, D. > 2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: When crude death rate is substracted from crude bih rate , the net residual is current annual grow rate exclusive of migration When the annual growth rate is > 2%, the population growth is said to be explosive Reference: Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 481', 'role': 'assistant'}]