system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Contraction of Demographic-Gap starts in:
assistant
The correct answer is  Demographic Cycle and Concepts

Demographic cycle is closely related to: Socio-economic progress of a country
5 stages (phases) of demographic cycle through which a nation passes