Night-blindness can be removed by :

Question

Accepted Answer

Night-blindness, also known as nyctalopia, is a condition where an individual has difficulty seeing in low light or darkness. This condition is primarily caused by a deficiency in Vitamin A, which is why Option 4 is the correct answer.

1. **Explanation for Option 4 (Vitamin A):**
   Vitamin A is essential for maintaining healthy vision. It is a crucial component of rhodopsin, a protein in the eyes that absorbs light in the retinal receptors. When there is a deficiency of Vitamin A, the production of rhodopsin is impaired, leading to difficulties in seeing in low-light conditions, which is characteristic of night-blindness. Consuming adequate amounts of Vitamin A through diet or supplements can help restore proper vision and alleviate night-blindness.

2. **Explanation for why other options are incorrect:**

- **Option 1 (Vitamin D):** 
     Vitamin D is primarily involved in calcium absorption and bone health. It plays no direct role in vision or the prevention of night-blindness. While it is important for overall health, it does not address the specific needs of the visual system related to night vision.

- **Option 2 (Vitamin B):**
     The Vitamin B complex is crucial for energy metabolism and the proper functioning of the nervous system. While some B vitamins are important for eye health, they do not specifically address the issue of night-blindness, which is directly linked to Vitamin A deficiency.

- **Option 3 (Vitamin C):**
     Vitamin C is an antioxidant that supports the immune system and helps in collagen production. It is beneficial for overall eye health and may help prevent cataracts, but it does not play a role in the prevention or treatment of night-blindness, which is specifically related to Vitamin A.

In conclusion, Vitamin A is the only vitamin among the options provided that directly addresses the cause of night-blindness, making Option 4 the correct answer.