The substance with the highest calorific value is

Options

A. milk
B. rice
C. ghee
D. egg

Explanation

To determine which substance has the highest calorific value among milk, rice, ghee, and egg, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Calorific Value**:
- Calorific value is defined as the amount of heat energy produced when a substance is completely combusted in the presence of oxygen. It is usually expressed in kilojoules per gram (kJ/g).

2. **Identify the Substances**:
- The substances we are comparing are:
- Milk
- Rice
- Ghee
- Egg

3. **Analyze the Nutritional Composition**:
- Each of these substances has different nutritional components:
- **Milk**: Contains proteins, fats, and carbohydrates.
- **Rice**: Primarily rich in carbohydrates.
- **Ghee**: High in fats.
- **Egg**: Contains proteins and fats.

4. **Determine the Calorific Values**:
- The calorific values of these substances can be summarized as follows:
- Ghee has the highest calorific value due to its high fat content.
- Rice has a moderate calorific value, primarily from carbohydrates.
- Milk and eggs have lower calorific values compared to ghee.

5. **Conclusion**:
- Based on the analysis, ghee has the highest calorific value among the options provided. The calorific value of ghee is approximately 150 kJ/g, which is higher than that of milk, rice, and egg.

### Final Answer:
The substance with the highest calorific value is **Ghee** (Option C).

---