Which of the following is not a components of Lecithin?

Options

A. Choline
B. Phosphate group
C. Sphingosine
D. Fatty acid

Answer

To determine which of the following is not a component of lecithin, we need to understand the structure and components of lecithin itself. Lecithin is a type of phospholipid, which is a class of lipids that are a major component of all cell membranes.

### Step-by-Step Solution:

1. **Understanding Lecithin**: Lecithin is primarily composed of a glycerol backbone, two fatty acid chains, a phosphate group, and a choline molecule. This structure is typical for phospholipids.

2. **Identifying Components**:
- **Glycerol**: This is the backbone of lecithin.
- **Fatty Acids**: Lecithin contains two fatty acid chains.
- **Phosphate Group**: One of the fatty acids is replaced by a phosphate group.
- **Choline**: This is attached to the phosphate group.

3. **Analyzing the Options**: The question asks which of the following is not a component of lecithin. The options typically include:
- Choline
- Phosphate
- Fatty Acids
- Sphingosine

4. **Identifying the Incorrect Component**:
- Choline, phosphate, and fatty acids are all components of lecithin.
- Sphingosine, however, is not a component of lecithin. Sphingosine is found in sphingomyelin, which is another type of lipid found in cell membranes, particularly in the brain.

5. **Conclusion**: Therefore, the correct answer is that sphingosine is not a component of lecithin.

### Final Answer:
**Sphingosine is not a component of lecithin.**