**Question:** Minimum and Maximum Values established for calculation of Life Expectancy index in HDI are

A. 0
B. 100
C. 0
D. 100

**Correct Answer:** D. 100

**Core Concept:** Human Development Index (HDI) is a summary index of average achievements in three basic dimensions of human development: a long and healthy life, knowledge, and a decent standard of living. Life expectancy is a key indicator of overall health and wellbeing, and it is used in calculating the HDI.

**Why the Correct Answer is Right:** The correct answer (D. 100) represents the maximum possible value for life expectancy, which is the average number of years a person is expected to live at birth. A life expectancy of 100 years is unrealistic and unattainable for humans, but it represents the theoretical upper limit, ensuring that the HDI remains positive and meaningful.

**Why Each Wrong Option is Incorrect:**

A. 0: This represents zero life expectancy, which is an impossible value for humans. Zero indicates no years of life expectancy, which is not meaningful for calculating the HDI.

B. 100: As explained above, 100 is an unrealistic maximum value for life expectancy, making it an incorrect choice for the HDI calculation.

C: Similar to option A, zero life expectancy is an implausible value and should not be considered in the HDI calculation.

**Why Life Expectancy is Crucial for HDI:** Life expectancy is crucial for calculating the HDI because it reflects the average number of years a person is expected to live at birth, which is a fundamental component of human development. By incorporating life expectancy, the HDI considers the health status of a population, contributing to a more comprehensive understanding of a country's overall wellbeing.

**Clinical Pearl:** The HDI is a composite index that helps assess the overall development of a country based on three primary dimensions: a long and healthy life (life expectancy), knowledge (education), and a decent standard of living (Gross National Product). Understanding the correct values for life expectancy is essential for interpreting the HDI accurately and making informed comparisons between different countries.