Which of the following is a triglyceride ?

Options

A. Wax
B. Phospholipid
C. Oil
D. Steroid

Explanation

To determine which of the given options is a triglyceride, we need to understand what a triglyceride is and analyze each option accordingly.

### Step-by-Step Solution:

1. **Understanding Triglycerides**:
- A triglyceride is a type of lipid that is formed from one glycerol molecule and three fatty acid molecules. It serves as a major form of energy storage in animals and plants.

2. **Analyzing the Options**:
- **Option 1: Wax**
- Waxes are esters formed from long-chain fatty acids and long-chain alcohols. They are hydrophobic and do not fit the definition of triglycerides.
- **Conclusion**: Not a triglyceride.

- **Option 2: Phospholipid**
- Phospholipids consist of a glycerol backbone, two fatty acids, and a phosphate group. While they are derived from fatty acids and glycerol, they differ from triglycerides because they contain a phosphate group and only two fatty acids.
- **Conclusion**: Not a triglyceride.

- **Option 3: Oil**
- Oils are liquid triglycerides at room temperature. They are composed of glycerol and three fatty acids, fitting the definition of triglycerides perfectly.
- **Conclusion**: This is a triglyceride.

- **Option 4: Steroid**
- Steroids are a class of lipids that have a structure distinct from triglycerides. They do not contain glycerol or fatty acids in the same way that triglycerides do.
- **Conclusion**: Not a triglyceride.

3. **Final Answer**:
- The correct answer is **oil**, as it is a triglyceride in its liquid form.