Assertion`:-` Epithelial tissue originated first during embryonic development.
Reason`:-` Most of bones of body are dermal.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False

Explanation

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

### Step 1: Analyze the Assertion
**Assertion:** Epithelial tissue originated first during embryonic development.

- Epithelial tissue is derived from the three germ layers formed during embryonic development: ectoderm, endoderm, and mesoderm.
- The first layer to form during embryonic development is the endoderm, which gives rise to various epithelial tissues, including the lining of the gastrointestinal tract.
- Therefore, the assertion is **true** because epithelial tissues do originate from these germ layers, with the endoderm being one of the first to form.

### Step 2: Analyze the Reason
**Reason:** Most of the bones of the body are dermal.

- Dermal bones, also known as membrane bones, are formed through a process called intramembranous ossification.
- Examples of dermal bones include the skull and jaw bones, but they do not constitute the majority of bones in the human body.
- Most bones are actually formed through endochondral ossification, which involves the replacement of cartilage with bone.
- Therefore, the reason is **false** because it inaccurately states that most bones are dermal.

### Conclusion
Based on the analysis:
- The assertion is **true**.
- The reason is **false**.

Thus, the correct answer is that only the assertion is true, while the reason is false.