## Core Concept
The Multicentre Growth Reference Study (MGRS) is a comprehensive study conducted by the World Health Organization (WHO) to develop a new growth standard for children. The study aimed to create a reference population that could be used globally to assess child growth and development. The MGRS provides a foundation for monitoring and evaluating child growth.

## Why the Correct Answer is Right
The correct answer, although not directly provided, relates to understanding the specifics of the MGRS. The MGRS was indeed a landmark study that involved over 8,500 children from six countries: Brazil, Ghana, India, Norway, Oman, and the USA. It was conducted from 1997 to 2003. A key aspect of the study was that it focused on healthy children, aiming to establish growth patterns in an optimal environment.

## Why Each Wrong Option is Incorrect
- **Option A:** Without specific details on option A, we can't directly address its inaccuracies. However, any statement contradicting the basic objectives, methodology, or outcomes of the MGRS would be incorrect.
- **Option B:** Similarly, without details, we assume any incorrect statement about the MGRS's scope, population, or conclusions would make B incorrect.
- **Option C:** This option's inaccuracy would stem from misrepresenting the study's findings, methodology, or its application in clinical practice.
- **Option D:** As the correct answer is associated with option D, it implies that D presents a statement that does not align with the known facts about the MGRS.

## Clinical Pearl / High-Yield Fact
A crucial point to remember is that the WHO growth charts, derived from the MGRS, are used globally to track children's growth, providing a universal standard for assessing growth and development. These charts replaced the older National Center for Health Statistics (NCHS) charts and are essential for pediatricians to monitor growth patterns.

## Correct Answer: D.