which of the following diseases is caused due to deficiency of vitamin A?

Options

A. Night blindness
B. Pellagra
C. Beri- beri
D. Cheilosis

Answer

To solve the question "Which of the following diseases is caused due to deficiency of vitamin A?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Options**: The question presents several options. We need to evaluate each one to determine which disease is linked to vitamin A deficiency.

2. **Evaluate Option 1: Night Blindness**:
- Night blindness is a condition where an individual has difficulty seeing in low light or darkness.
- This condition is directly associated with a deficiency of vitamin A, as vitamin A is crucial for the production of rhodopsin, a pigment in the retina that helps with vision in low light.
- **Conclusion**: Night blindness is caused by vitamin A deficiency.

3. **Evaluate Option 2: Pellagra**:
- Pellagra is a disease characterized by dermatitis, diarrhea, and dementia.
- It is caused by a deficiency of vitamin B3 (niacin), not vitamin A.
- **Conclusion**: Pellagra is not related to vitamin A deficiency.

4. **Evaluate Option 3: Beriberi**:
- Beriberi is a disease that affects the cardiovascular and nervous systems.
- It is caused by a deficiency of vitamin B1 (thiamine).
- **Conclusion**: Beriberi is not related to vitamin A deficiency.

5. **Evaluate Option 4: Chloasma**:
- Chloasma, also known as melasma, is a skin condition characterized by dark patches on the skin.
- It is associated with hormonal changes and is not caused by vitamin A deficiency; it is related to riboflavin (vitamin B2) deficiency in some contexts.
- **Conclusion**: Chloasma is not related to vitamin A deficiency.

6. **Final Conclusion**:
- Based on the evaluations, the only disease caused by vitamin A deficiency is **Night Blindness**.

### Answer:
The disease caused due to deficiency of vitamin A is **Night Blindness**.

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