Lungs are enclosed in

Options

A. periosteum
B. perichondrium
C. pericardium
D. pleural membranes

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks what structure encloses the lungs. We need to identify the correct anatomical term that describes this enclosure.

2. **Analyzing the Options**:
- **Option A: Periosteum** - This is a membrane that covers the outer surface of bones, not related to the lungs.
- **Option B: Pericondrium** - This is a layer of connective tissue that surrounds cartilage, also not related to the lungs.
- **Option C: Pericardium** - This is the membrane surrounding the heart, which is not the correct answer for the lungs.
- **Option D: Pleural Rib** - This option seems to refer to the pleura, which is indeed related to the lungs.

3. **Identifying the Correct Structure**: The lungs are enclosed by a double-layered serous membrane known as the pleura. The pleura consists of two layers:
- **Visceral Pleura**: This layer is directly attached to the surface of the lungs.
- **Parietal Pleura**: This layer lines the thoracic cavity.

4. **Conclusion**: Since the lungs are enclosed by the pleura, the correct answer is **Option D: Pleural membranes**.

### Final Answer:
Lungs are enclosed in **pleural membranes** (Option D).

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