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
Which of the following stages of demographic cycle has declining population: 
Select and explain. 
A. Second, B. Third, C. Fouh, D. Fifth
D: Fifth
Answer: D: Fifth 
Explanation: Fifth stage (declining): Population begins to decline because the bih rate is lower than the death rate. Ref: Park, 22nd edition pg: 441