Which one of the following pairs is correctly matched?
`{:((i), "Vitamin " B _(12),, (a), "Anaemia"),((ii),"Vitamin" A ,, (b), "Night blindness"),((iii), "Vitamin"C ,, (c), "Scurvy"),((iv), "Vitamin" E ,, (d), "sterility"):}`

Options

A. (i) - a , (ii) - b (iii) - c (iv) - d
B. (i) - b (ii) - c (iii) - d (iv) - a
C. (i) - d , (ii) - c (iii) - a (iv) - b
D. None of these

Explanation

To solve the question of which pairs of vitamins and their associated diseases are correctly matched, we will analyze each vitamin and the disease it is known to cause when deficient.

### Step-by-Step Solution:

1. **Identify the Vitamins and Their Functions**:
- Vitamin B12: Known for its role in red blood cell formation and neurological function.
- Vitamin A: Important for vision, particularly in low-light conditions.
- Vitamin C: Essential for the synthesis of collagen and acts as an antioxidant.
- Vitamin E: Plays a role in protecting cells from oxidative stress and is important for immune function.

2. **Match Each Vitamin with Its Associated Disease**:
- **Vitamin B12**: A deficiency leads to **Anemia** (specifically, pernicious anemia).
- **Vitamin A**: A deficiency leads to **Night blindness**, which is the inability to see well in low light.
- **Vitamin C**: A deficiency leads to **Scurvy**, characterized by bleeding gums and weakness.
- **Vitamin E**: A deficiency can lead to **Sterility**, particularly in animal studies, and can also affect reproduction.

3. **List the Matches**:
- (i) Vitamin B12 - (a) Anemia
- (ii) Vitamin A - (b) Night blindness
- (iii) Vitamin C - (c) Scurvy
- (iv) Vitamin E - (d) Sterility

4. **Determine the Correct Pair**:
- All the matches listed above are correct:
- (i) matches with (a)
- (ii) matches with (b)
- (iii) matches with (c)
- (iv) matches with (d)

5. **Select the Correct Option**:
- The correct option that matches all pairs is:
- Option 1: (i) - (a), (ii) - (b), (iii) - (c), (iv) - (d)

### Final Answer:
The correctly matched pairs are:
- (i) Vitamin B12 - (a) Anemia
- (ii) Vitamin A - (b) Night blindness
- (iii) Vitamin C - (c) Scurvy
- (iv) Vitamin E - (d) Sterility

Thus, the answer is **Option A**.