The highest calorific value is found in

Options

A. proteins
B. fats
C. vitamins
D. carbohydrates

Explanation

To determine which biomolecule has the highest calorific value, we need to analyze the calorific values of proteins, fats, carbohydrates, and vitamins.

### Step-by-Step Solution:

1. **Understanding Calorific Value**:
- Calorific value refers to the amount of energy (in kilojoules) released when a biomolecule is burned.

2. **Calorific Values of Biomolecules**:
- **Carbohydrates**: When 1 gram of carbohydrate is burned, it releases approximately 17 kJ of energy.
- **Fats**: When 1 gram of fat is burned, it releases approximately 37 kJ of energy.
- **Proteins**: The calorific value of proteins is lower than that of fats and carbohydrates, typically around 17 kJ per gram, similar to carbohydrates.
- **Vitamins**: Vitamins do not provide calorific value, as they do not yield energy when burned.

3. **Comparison**:
- Comparing the calorific values:
- Carbohydrates: 17 kJ/g
- Fats: 37 kJ/g
- Proteins: ~17 kJ/g
- Vitamins: 0 kJ/g
- From this comparison, it is clear that fats have the highest calorific value.

4. **Conclusion**:
- Therefore, the biomolecule with the highest calorific value is **Fats**.

### Final Answer:
The highest calorific value is found in **Fats**.