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': 'The age and sex structure of a population can be described by a \nSelect and explain. \nA. Life table, B. Correlation coefficient, C. Population pyramid, D. Bar cha', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The age and sex structure of a population are best represented by &;age pyramid&;.Developing countries have a broad base and tapering top. Developed countries show a bulge in the middle and have a narrower base.Park 23e pg: 482', 'role': 'assistant'}]