Which one of the following is mismatched?

Options

A. Vitamin-K - Beri-beri
B. Vitamin-D-Rickets
C. Vitamin-C - Scurvy
D. Vitamin-A - Xerophthalmia

Explanation

To determine which of the following vitamin-disease pairs is mismatched, let's analyze each option provided:

1. **Vitamin K to Beriberi**:
- Beriberi is a disease caused by the deficiency of Vitamin B1 (Thiamine). Therefore, this pairing is incorrect. Vitamin K is not related to beriberi.

2. **Vitamin D to Rickets**:
- Rickets is indeed caused by the deficiency of Vitamin D. This pairing is correct.

3. **Vitamin C to Scurvy**:
- Scurvy is caused by a deficiency of Vitamin C. This pairing is also correct.

4. **Vitamin A to Xerophthalmia**:
- Xerophthalmia is a condition caused by a deficiency of Vitamin A. This pairing is correct as well.

Based on the analysis, the mismatched pair is:

**Vitamin K to Beriberi**

### Steps to Solution:
1. **Identify each vitamin and its associated disease**: Look at the diseases mentioned and the vitamins associated with them.
2. **Cross-reference with known vitamin deficiencies**: Use knowledge of vitamin deficiencies to determine if the pairings are accurate.
3. **Identify the incorrect pairing**: Find the pairing that does not match the correct vitamin deficiency.