Deficiency of what vitamins will cause the following diseases :
Night blindness.

Explanation

**Step-by-Step Solution:**

1. **Identify the Disease**: The disease in question is night blindness, also known as xerophthalmia.

2. **Understand the Role of Vitamins**: Night blindness is primarily associated with the deficiency of certain vitamins. In this case, we need to identify which vitamin is crucial for preventing this condition.

3. **Recognize the Vitamin Involved**: The vitamin that is essential for maintaining healthy vision and preventing night blindness is Vitamin A.

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