Assertion : Mucus associated lymphoid tissues are specialised immune barrier located on skin.
Reason : These lymphoid tissues are located within tonsils, adenoids and Peyer's patches.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertin is true but reason is false.
D. If both assertion and reason are false.

Explanation

To analyze the given assertion and reason, let's break down the statements step by step.

### Step 1: Evaluate the Assertion
The assertion states that "Mucus associated lymphoid tissues are specialized immune barrier located on skin."

- Mucus-associated lymphoid tissues (MALT) are indeed specialized immune tissues, but they are not located on the skin. Instead, they are found in mucosal surfaces such as the gastrointestinal tract, respiratory tract, and urogenital tract.
- Therefore, the assertion is **false** because it incorrectly states the location of MALT.

### Step 2: Evaluate the Reason
The reason states that "These lymphoid tissues are located within tonsils, adenoids, and Peyer's patches."

- This statement is true. Tonsils, adenoids, and Peyer's patches are indeed types of MALT and are located in the mucosal surfaces of the body.
- However, the reason does not correctly explain the assertion because the assertion itself is false.

### Step 3: Conclusion
Since both the assertion and the reason are false, we can conclude:

- **Assertion: False**
- **Reason: True**

### Final Answer
Both the assertion and the reason are false.