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': 'Which of the following stages of demographic cycle has expanding population? \nSelect and explain. \nA. Second, B. Third, C. Both of the above, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stages of demographic cycle are: First stage (High stationary) Second stage (Early expanding) Third stage (late expanding) Fouh stage (Low stationary) Fifth stage (declining) Ref: Park, 22nd edition pg: 441', 'role': 'assistant'}]