Following are the properties of four minerals P, Q, R and S. Identify them and select the correct option.
P: It is required for proper functioning of thyroid gland.
Q: It helps in maintaining body's water balance.
R: It is important for haemoglobin formation
S: It strengthens bones and teeth and helps in blood clotting.

Options

A. Deficiency of P causes dryness of eyes and inflammation of tongue.
B. Q is also required for the proper functioning of nervous system.
C. Deficiency of R causes goitre.
D. S also helps to fight infections and keeps skin and mouth healthy.

Explanation

To identify the minerals P, Q, R, and S based on the properties given, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Mineral P**:
- The property states that it is required for the proper functioning of the thyroid gland.
- The mineral that is essential for the thyroid gland is **Iodine**.
- **Conclusion**: P = Iodine

2. **Identify Mineral Q**:
- The property states that it helps in maintaining the body's water balance.
- The mineral responsible for maintaining water balance in the body is **Sodium**.
- **Conclusion**: Q = Sodium

3. **Identify Mineral R**:
- The property states that it is important for hemoglobin formation.
- The mineral crucial for hemoglobin formation is **Iron**.
- **Conclusion**: R = Iron

4. **Identify Mineral S**:
- The property states that it strengthens bones and teeth and helps in blood clotting.
- The mineral that strengthens bones and teeth and is also involved in blood clotting is **Calcium**.
- **Conclusion**: S = Calcium

### Final Identification:
- P = Iodine
- Q = Sodium
- R = Iron
- S = Calcium