[A] : In old age, the skin gets wrinkled.
[R]: Epidermis has a single layer of cells.

Options

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

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
**Assertion (A): In old age, the skin gets wrinkled.**

- As people age, their skin undergoes various changes. One of the most noticeable changes is the formation of wrinkles.
- The primary reason for this is that skin cell division slows down with age.
- Additionally, the dermis, which is the middle layer of the skin, becomes thinner over time.
- The dermis contains elastin and collagen fibers that provide support and elasticity to the skin.
- With aging, these fibers loosen and the network becomes less effective, leading to the formation of wrinkles.

**Conclusion for Assertion:** The assertion is true.

### Step 2: Analyze the Reason
**Reason (R): Epidermis has a single layer of cells.**

- The epidermis is the outermost layer of the skin.
- Contrary to the statement, the epidermis consists of multiple layers of cells, typically four to five layers depending on the region of the skin.
- The layers include the stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale.
- Therefore, the statement that the epidermis has a single layer of cells is incorrect.

**Conclusion for Reason:** The reason is false.

### Step 3: Determine the Relationship
- The assertion is true, but the reason is false.
- Therefore, the correct answer is that the assertion is true and the reason is false.

### Final Answer:
**Assertion true, Reason false.**

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