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
The age and sex structure of a population may be described by a 
Select and explain. 
A. Life table, B. Correlation coefficient, C. Population pyramid, D. Bar chart
C: Population pyramid
Answer: C: Population pyramid 
Explanation: Population pyramid: (age-sex pyramid or age-structure diagram) Is a graphical illustration that shows the distribution of various age groups in a population which normally forms the shape of a pyramid

– Double Histogram: 2 back-to-back histogram graphs
1. one showing the number of males and
2. one showing females in a particular population (Males are conventionally shown on left and females on right)
– The population (%) is plotted on the X-axis and age on the Y-axis (in 5-year age group intervals)