A sugar of animal origin is

Options

A. fructose
B. lactose
C. DHAP
D. PGA

Answer

To determine which sugar is of animal origin among the options provided (fructose, lactose, DHAP, and PGA), we can analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Animal Origin**:
- We need to identify which sugar is derived from animals. This means we are looking for a sugar that is typically found in animal products or produced by animals.

2. **Analyzing Fructose**:
- Fructose is a sugar commonly found in fruits and honey. It is not specifically derived from animals, so it does not fit our criteria.

3. **Analyzing DHAP (Dihydroxyacetone Phosphate)**:
- DHAP is an intermediate in the glycolysis pathway, which is a metabolic process that occurs in both plants and animals. However, it is not a sugar that is directly obtained from animals.

4. **Analyzing PGA (Phosphoglyceric Acid)**:
- Similar to DHAP, PGA is also an intermediate in glycolysis. It is involved in energy metabolism but is not a sugar that comes from animal sources.

5. **Analyzing Lactose**:
- Lactose is a disaccharide sugar that is found in milk and dairy products. It is composed of one glucose molecule and one galactose molecule. Since lactose is derived from animal milk, it is indeed a sugar of animal origin.

6. **Conclusion**:
- Based on the analysis, the correct answer is **lactose**. It is the only sugar among the options that is specifically derived from animals.

### Final Answer:
The sugar of animal origin is **lactose**.

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