The minerals responsible for the maintenance of fluid balance in the body are:

Options

A. Sodium and Postassium
B. Sodium and Calcium
C. Calcium and Magnesium
D. Potassium and Magesium

Answer

To solve the question regarding the minerals responsible for the maintenance of fluid balance in the body, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fluid Balance**:
- Fluid balance in the body is primarily maintained by electrolytes, which are minerals that carry an electric charge. These electrolytes help regulate the amount of water in the body and are essential for various bodily functions.

2. **Identifying Key Electrolytes**:
- The main electrolytes involved in fluid balance are sodium (Na+), potassium (K+), calcium (Ca2+), magnesium (Mg2+), and bicarbonate (HCO3-). However, not all of these are equally responsible for maintaining fluid balance.

3. **Evaluating the Options**:
- The options given are:
- A) Sodium
- B) Potassium
- C) Sodium and Calcium
- D) Calcium and Magnesium
- E) Potassium and Magnesium

4. **Analyzing Each Option**:
- **Option A (Sodium)**: Sodium is a key electrolyte that helps regulate fluid balance by controlling the amount of water retained in the body.
- **Option B (Potassium)**: Potassium also plays a crucial role in fluid balance by working alongside sodium in maintaining cellular function and fluid distribution.
- **Option C (Sodium and Calcium)**: Calcium is not primarily involved in fluid balance; it is more associated with bone health and muscle function.
- **Option D (Calcium and Magnesium)**: While magnesium is important for various bodily functions, it is not a primary electrolyte for fluid balance.
- **Option E (Potassium and Magnesium)**: Magnesium is not primarily responsible for fluid balance.

5. **Conclusion**:
- The minerals that are primarily responsible for the maintenance of fluid balance in the body are **Sodium and Potassium**. Therefore, the correct answer is **Option A (Sodium and Potassium)**.

### Final Answer:
The minerals responsible for the maintenance of fluid balance in the body are Sodium and Potassium.