Which of the following can be taken as isotonic vitamins?

Options

A. Thiamine and phylioquinone
B. Calciferol and niacin
C. Phylloquinone and menadione
D. Retinol and riboflavin

Answer

To determine which of the following can be taken as isotonic vitamins, we need to understand what isotonic vitamins are and analyze the options provided.

### Step-by-Step Solution:

1. **Define Isotonic Vitamins**:
Isotonic vitamins are dietary supplements that are formulated in an isotonic solution. This means that they have the same osmotic pressure as body fluids, allowing for easier absorption in the body. The isotonic state enables nutrients to pass directly into the small intestine and be rapidly absorbed into the bloodstream.

2. **Analyze the Options**:
The options given are:
- A) Thiamine, Phylloquinone
- B) Calciferol, Niacin
- C) Phylloquinone, Minadione
- D) Retinol, Riboflavin

3. **Evaluate Each Option**:
- **Option A (Thiamine, Phylloquinone)**:
- Thiamine (Vitamin B1) is a water-soluble vitamin.
- Phylloquinone (Vitamin K) is a fat-soluble vitamin.
- This combination does not indicate isotonic properties.

- **Option B (Calciferol, Niacin)**:
- Calciferol (Vitamin D2) is fat-soluble.
- Niacin (Vitamin B3) is water-soluble.
- This combination does not indicate isotonic properties.

- **Option C (Phylloquinone, Minadione)**:
- Phylloquinone is Vitamin K (fat-soluble).
- Minadione is Vitamin K3, which is also fat-soluble.
- Both are related to vitamin K and can be formulated in isotonic solutions.

- **Option D (Retinol, Riboflavin)**:
- Retinol (Vitamin A) is fat-soluble.
- Riboflavin (Vitamin B2) is water-soluble.
- This combination does not indicate isotonic properties.

4. **Conclusion**:
Based on the analysis, the correct answer is **Option C: Phylloquinone and Minadione**. Both are related to Vitamin K and can be formulated as isotonic vitamins.

### Final Answer:
**Option C: Phylloquinone and Minadione**