Malt sugar is

Options

A. Lactose
B. Glucose
C. Maltose
D. Fructose

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks to identify what malt sugar is from the given options: lactose, glucose, maltose, and fructose.

2. **Analyzing Each Option**:
- **Option A: Lactose**:
- Lactose is a disaccharide composed of two monosaccharides: glucose and galactose. It is commonly known as milk sugar. Therefore, lactose is not malt sugar.

- **Option B: Glucose**:
- Glucose is a monosaccharide, which means it is a simple sugar and not a disaccharide. Thus, glucose cannot be malt sugar.

- **Option C: Maltose**:
- Maltose is a disaccharide made up of two glucose molecules. It is specifically known as malt sugar. Therefore, maltose is the correct answer.

- **Option D: Fructose**:
- Fructose is also a monosaccharide, commonly referred to as fruit sugar. It is not a disaccharide and thus cannot be malt sugar.

3. **Conclusion**: After analyzing all the options, the correct answer is **maltose**, which is the malt sugar.

**Final Answer**: Malt sugar is **maltose**.

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