## Core Concept
The World Health Organization (WHO) is a specialized agency of the United Nations responsible for international public health. It was established on April 7, 1948. The core concept here revolves around the founding date of WHO.

## Why the Correct Answer is Right
The World Health Organization (WHO) was indeed established on April 7, 1948. This date marks the formation of WHO as an international organization focused on promoting health, keeping the world safe, and serving the vulnerable. The establishment of WHO is a significant milestone in global health governance.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not correspond with the known formation date of WHO.
- **Option B:** Similarly, this option does not align with the historical records of WHO's establishment.
- **Option D:** This option is also incorrect as it suggests a different date that does not match the actual founding date of WHO.

## Clinical Pearl / High-Yield Fact
A key point to remember is that April 7th is celebrated as World Health Day, which commemorates the founding of WHO in 1948. This day is used to promote global health awareness and is a significant event in the public health calendar.

## Correct Answer: C. 7th April 1948