## **Core Concept**
The World Health Day is an annual event celebrated by the World Health Organization (WHO) to commemorate its founding. The WHO was established on April 7, 1948.

## **Why the Correct Answer is Right**
The correct answer, **April 7**, is the date when the World Health Organization (WHO) was founded in 1948. Every year on this date, World Health Day is observed to mark the founding of WHO and to focus on a specific theme related to global health.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is blank and does not provide a date, making it an incorrect choice by default.
- **Option B:** This option is also blank and does not provide a date, making it incorrect.
- **Option C:** Similarly, this option is blank without a date and is incorrect.
- **Option D:** This option is blank as well and lacks a date, making it incorrect.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that World Health Day is celebrated on **April 7th** every year. This day is an opportunity for people around the world to focus on specific health themes that are of great importance.

## **Correct Answer:** . **April 7**