Duct of mammary gland is composed of :-

Options

A. St. cuboidal epithelium
B. St . Columner epithelium
C. St . Squamous epithelium
D. Pseudostratified epithelium.

Answer

### Step-by-Step Solution:

1. **Understanding the Duct of Mammary Glands**: The mammary glands are responsible for milk production and secretion, and they contain ducts that transport the milk.

2. **Identifying the Types of Epithelial Tissue**: The question provides four options for the type of epithelium that makes up the ducts:
- Stratified cuboidal epithelium
- Stratified columnar epithelium
- Stratified squamous epithelium
- Pseudostratified epithelium

3. **Analyzing the Options**:
- **Stratified Cuboidal Epithelium**: This type consists of multiple layers of cuboidal cells. It is commonly found in glands and ducts.
- **Stratified Columnar Epithelium**: This type has multiple layers with the superficial layer being columnar. It is less common and not typically found in mammary glands.
- **Stratified Squamous Epithelium**: This type consists of multiple layers of flat cells and is usually found in areas subject to abrasion, such as skin.
- **Pseudostratified Epithelium**: This type appears to be stratified but is actually a single layer of cells of varying heights. It is commonly found in the respiratory tract.

4. **Conclusion**: The ducts of the mammary glands are primarily composed of stratified cuboidal epithelium, which allows for the transport of milk and provides some protection.

5. **Final Answer**: The duct of the mammary gland is composed of **stratified cuboidal epithelium**.