Given any for factors necessary for a healthy person.

Explanation

### Step-by-Step Solution:

1. **Definition of Health**: A healthy person is one who is physically, mentally, and socially fit. This holistic approach to health encompasses various aspects of well-being.

2. **Hygienic Surroundings**:
- A clean and hygienic environment is crucial for maintaining health. It reduces the risk of physical, mental, or social illnesses.
- Hygienic surroundings help prevent air and water-borne diseases, which can significantly impact health.

3. **Balanced Diet**:
- Consuming a balanced and nutritious diet is essential for good health.
- A proper diet provides the necessary nutrients that help build a strong immune system, enabling the body to fight off disease-causing microorganisms.

4. **Personal Hygiene**:
- Maintaining personal hygiene is vital for preventing infections and diseases.
- Good personal hygiene practices help reduce the risk of fungal and other infectious diseases, contributing to overall health.

5. **Immunization**:
- Immunization against severe diseases is a critical factor for maintaining health.
- Vaccines provide artificial immunity, which, along with natural immunity, helps the body combat various diseases effectively.

### Summary of Four Factors Necessary for a Healthy Person:
1. Hygienic surroundings
2. Balanced diet
3. Personal hygiene
4. Immunization against severe diseases

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