Microspheres possessed a membrane of

Options

A. Lipid and protein
B. Lipid
C. Carbohydrates
D. Fats

Answer

### Step-by-Step Solution

1. **Understanding Microspheres**:
- Microspheres are spherical structures that can be formed from biodegradable materials. They are small in size, typically ranging from micrometers to nanometers in diameter.

2. **Composition of Microspheres**:
- The composition of microspheres can vary, but they are often made from biodegradable substances. These substances can be broken down by bacteria or other living organisms.

3. **Function of Microspheres**:
- Microspheres can be filled with various substances, such as drugs or antibodies. When introduced into the body, the microspheres degrade over time, releasing their contents to perform their intended function.

4. **Membrane Composition**:
- The question specifically asks about the membrane of microspheres. It is important to identify what materials typically make up the membranes of these structures.

5. **Identifying the Correct Answer**:
- Based on the information provided, the membrane of microspheres is primarily composed of lipids. Therefore, the correct answer to the question is that microspheres possess a membrane of **lipid**.

### Final Answer
- The correct answer is **b) lipid**.

---