Which of the following lines the urinary bladder ?

Options

A. Simple epithelium
B. Transitional epithelium
C. Stratified epithelium
D. Pseudostratified epithelium

Answer

### Step-by-Step Solution:

1. **Identify the Structure in Question**: The question asks about the lining of the urinary bladder. We need to determine what type of epithelium is present in this organ.

2. **Understand the Epithelium Types**: There are various types of epithelial tissues in the body, including simple squamous, cuboidal, columnar, stratified, and transitional epithelium. Each type has specific locations and functions.

3. **Focus on the Urinary Bladder**: The urinary bladder is part of the urinary tract, which includes organs that store and transport urine. The lining of the urinary bladder must be specialized to accommodate the stretching that occurs when the bladder fills with urine.

4. **Identify the Specific Epithelium**: The epithelium that lines the urinary bladder is called urothelium, which is a type of transitional epithelium. This type of epithelium is specifically adapted for the urinary system.

5. **Characteristics of Urothelium**: Urothelium consists of 3 to 4 layers of cells. It has a thick protective layer of glycoprotein on the apical surface, which helps in protecting the underlying tissues from the urine's toxic components.

6. **Conclusion**: Based on the information gathered, the correct answer to the question is that the urinary bladder is lined by transitional epithelium.

### Final Answer:
The urinary bladder is lined by **transitional epithelium**.

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