Squamous epithelium occurs in inner lining of
(a) Kidney
(b) Pancreatic duct
(c) Lung alveoli
(d) Liver

Options

A. Kidney
B. Pancreatic duct
C. Lung alveoli
D. Liver

Answer

To determine where squamous epithelium occurs in the inner lining, we can analyze each option provided:

1. **Understanding Squamous Epithelium**:
- Squamous epithelium, also known as pavement epithelium, is characterized by flat, thin cells arranged in a single layer. This structure is ideal for functions such as diffusion and filtration.

2. **Analyzing Each Option**:
- **(a) Kidney**: The kidney contains various types of epithelium, including cuboidal and columnar epithelium, especially in the renal tubules. Squamous epithelium is not the primary type found here.
- **(b) Pancreatic Duct**: The pancreatic duct is lined with cuboidal epithelium, which aids in secretion and absorption. Squamous epithelium is not typically found in this structure.
- **(c) Lung Alveoli**: The alveoli are tiny air sacs in the lungs where gas exchange occurs. They are lined with simple squamous epithelium, which facilitates the diffusion of oxygen and carbon dioxide due to its thinness.
- **(d) Liver**: The liver is primarily composed of hepatocytes and has a different type of epithelium associated with bile ducts, not squamous epithelium.

3. **Conclusion**:
- Based on the analysis, the correct answer is **(c) Lung alveoli**, as they are lined with squamous epithelium which is essential for gas exchange.

### Final Answer:
(c) Lung alveoli