Vitamins are essential micronutrients that the body requires in small amounts for various metabolic processes. Deficiency of these vitamins leads to specific clinical conditions.
Let us examine each pair in the given lists:
1. Scurvy: Scurvy is a disease characterized by bleeding gums and delayed wound healing. It is caused by a deficiency of Vitamin C, chemically known as Ascorbic Acid. Therefore, A matches with III.
2. Convulsions: Convulsions or seizures can be caused by a deficiency of Vitamin $B_6$, which is chemically known as Pyridoxine. Vitamin $B_6$ is involved in the synthesis of neurotransmitters. Therefore, B matches with I.
3. Cheilosis: Cheilosis involves inflammation and cracking at the corners of the mouth. It is a classic symptom of a deficiency of Vitamin $B_2$, which is also known as Riboflavin. Therefore, C matches with IV.
4. Xerophthalmia: Xerophthalmia is a condition where the eyes fail to produce tears, leading to dryness and potential blindness. It is caused by a deficiency of Vitamin A. Therefore, D matches with II.
Combining these matches, we get:
A-III, B-I, C-IV, D-II.