Which of the following is not a type of tissue ?

Options

A. Muscle
B. Embryonic
C. Nervous
D. Epithelial

Explanation

To determine which of the following options is not a type of tissue, we will analyze each option provided:

1. **Muscles**:
- Muscles are indeed a type of tissue. They are responsible for movement in the body and can be classified into three types: skeletal, cardiac, and smooth muscle tissues.

2. **Embryonic**:
- The term "embryonic" refers to tissues that are involved in the development of an embryo. While embryonic tissues play a crucial role in development, they are not classified as a specific tissue type like muscle, nervous, or epithelial tissues. Instead, they are more of a developmental stage rather than a distinct tissue type.

3. **Nervous**:
- Nervous tissue is a type of tissue that makes up the nervous system. It consists of neurons and glial cells, which are essential for transmitting signals throughout the body.

4. **Epithelial**:
- Epithelial tissue is another recognized type of tissue that forms the outer layer of organs and structures in the body. It serves various functions, including protection, absorption, and secretion.

Based on the analysis above, the option that is not a type of tissue is **embryonic**.

### Final Answer:
**Embryonic**