Vitamins Hormones Enzymes

Hint: Vitamin B₆ deficiency can cause neurological symptoms like convulsions.

Explanation:
A. Vitamin B₁₂: Vitamin B₁₂ deficiency leads to pernicious anemia, a condition where the body cannot produce enough healthy red blood cells due to a lack of B₁₂, often linked to poor absorption. This matches with IV. Pernicious anemia.

B. Vitamin D: Vitamin D deficiency causes rickets in children, a disease characterized by weakened bones, leading to deformities, as Vitamin D is essential for calcium absorption and bone health. This matches with III. Rickets.

C. Vitamin B₂: Also known as riboflavin, Vitamin B₂ deficiency results in cheilosis (also spelled as cheilosis in the list), which involves inflammation and cracking at the corners of the mouth, along with other symptoms like sore throat or skin issues. This matches with I. Cheilosis.

D. Vitamin B₆: Vitamin B₆ deficiency can cause neurological symptoms like convulsions, especially in infants, as B₆ is crucial for neurotransmitter synthesis. This matches with II. Convulsions.