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
Which one of the following is NOT a socio-economic indicator? 
Select and explain. 
A. Literacy rate, B. Life expectancy at birth, C. Housing, D. Family size
B: Life expectancy at birth
Answer: B: Life expectancy at birth 
Explanation: Socio-economic indicators:


Housing
Family size
Literacy rate
Availability per capitacalorie
Per capita GNP
Growth rate
Level of unEmployment
Dependency ratio