The correct statement is

Options

A. Glucose and mannose are C - 3 epimers
B. Glucose and Galactose are `C-4` epimers
C. Glucose and frucotse are anomers
D. `alpha-D-`glucose and `beta-D-`glucose are enantiomers

Answer

To solve the question regarding the correct statement about the sugars glucose, mannose, galactose, and fructose, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding Epimers**:
- Epimers are sugars that differ in configuration at only one specific asymmetric carbon atom.

2. **Analyzing the First Statement**:
- **Statement**: "Glucose and mannose are C3 epimers."
- **Structures**:
- Glucose:
```
HOCH2-(CHOH)4-CHO
```
- Mannose:
```
HOCH2-(CHOH)2-CHOH-CHO
```
- **Analysis**:
- Upon examining the structures, we find that glucose and mannose differ at the C2 carbon, not C3.
- **Conclusion**: This statement is **incorrect**.

3. **Analyzing the Second Statement**:
- **Statement**: "Glucose and galactose are C4 epimers."
- **Structures**:
- Glucose:
```
HOCH2-(CHOH)4-CHO
```
- Galactose:
```
HOCH2-(CHOH)3-CHOH-CHO
```
- **Analysis**:
- Glucose and galactose differ in configuration at the C4 carbon.
- **Conclusion**: This statement is **correct**.

4. **Analyzing the Third Statement**:
- **Statement**: "Glucose and fructose are anomers."
- **Structures**:
- Glucose (Aldose):
```
HOCH2-(CHOH)4-CHO
```
- Fructose (Ketose):
```
HOCH2-(C=O)-(CHOH)3
```
- **Analysis**:
- Glucose has an aldehyde group while fructose has a ketone group, making them functional isomers rather than anomers.
- **Conclusion**: This statement is **incorrect**.

5. **Analyzing the Fourth Statement**:
- **Statement**: "Alpha D glucose and beta D glucose are enantiomers."
- **Analysis**:
- Alpha-D glucose and beta-D glucose are stereoisomers that differ at one specific carbon (C1), making them diastereomers, not enantiomers.
- **Conclusion**: This statement is **incorrect**.

### Final Conclusion:
The only correct statement among the options provided is that **glucose and galactose are C4 epimers**.