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 may be best described by \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 composition of a country can be best described by population pyramid. Age group from 0-80+ is represented in a scale and the male and female population are represented on either side of the population pyramid. Reference: Park&;s textbook of preventive and social medicine, 23rd edition, pg no: 482,483', 'role': 'assistant'}]