On which date is World Health Day observed every year to mark the anniversary of the founding of the World Health Organization (WHO)?

Introduction / Context:
World Health Day is one of the most important international health observances. It is coordinated by the World Health Organization (WHO) and focuses each year on a specific theme related to global health. This question tests your ability to recall the exact date on which World Health Day is celebrated annually, an often-asked static fact in general knowledge and exam papers.

Given Data / Assumptions:
• The question asks for the specific calendar date of World Health Day.
• The options are 8th April, 10th April, 7th April and 9th April, all in early April.
• It is assumed that you know that World Health Day commemorates the founding of WHO and that WHO came into existence in early April 1948.

Concept / Approach:
The concept is simple: World Health Day is observed every year on the anniversary of the founding of WHO. WHO was founded on 7 April 1948. To honour this date, 7 April was chosen by the World Health Assembly as World Health Day. So, if you remember the founding date of WHO or the standard formula “World Health Day is on 7 April,” you can directly pick the correct option from the list.

Step-by-Step Solution:
Step 1: Recall that the World Health Organization came into formal existence on 7 April 1948.Step 2: Remember that to mark this founding date, the WHO and the international community observe World Health Day every year on 7 April.Step 3: Compare this with the answer options: 7 April appears exactly as option “7th April.”Step 4: Eliminate the other dates (8th, 9th and 10th April) because they do not correspond to the WHO founding anniversary.Step 5: Conclude that 7th April is the correct date for World Health Day.

Verification / Alternative Check:
As a quick check, think of the common memory trick used in many exam guides: “W H O = W H D = 7 April.” They often point out that both WHO and World Health Day are linked to 7 April, and each year WHO announces a campaign theme that launches on or around that date. This triple association makes it easy to verify that 7 April is correct.

Why Other Options Are Wrong:
• 8th April: Very close to the correct date but historically not the anniversary chosen by WHO, so it is incorrect.
• 10th April: Not connected to the founding of WHO and used in some countries for other observances, but not World Health Day.
• 9th April: Again, near in time but not the formal date recognized by WHO for this global health observance.

Common Pitfalls:
Because all options cluster around early April, many students get confused and think the exact date is unimportant. Some may also mix up World Health Day with other days like World TB Day or World Malaria Day, which fall on different dates. To avoid this, remember a simple phrase such as “7 April = WHO Day” so that the correct date stays fixed in your mind.

Final Answer:
World Health Day is observed every year on 7th April.