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B
life expectancy at the age of 5
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C
life expectancy at the age of 18
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D
life expectancy at the age of 60
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Solution
The correct option is A life expectancy at birth Longevity is measured in terms of life expectancy at birth. Longevity is one of the indicators of Human Development Index. Life expectancy at birth can be defined as a statistical measure which reflects the mortality rate in an economy.