Which one of the following pairs is not correctly matched?

Pernicious anemia occurs when the body can't absorb enough vitamin B12 to function properly. Vitamin B6 is used by the body every single day since it plays a part in such major functions including movement, memory and energy expenditure. Deficiency of vitamin B6 results in the loss of appetite. Beriberi is a disease caused by a vitamin B1 deficiency, also known as thiamine deficiency. There are two types of the disease: wet beriberi and dry beriberi. Pellagra is a disease characterized by diarrhea, dermatitis, and dementia. It occurs as a result of niacin (vitamin B3) deficiency. Niacin is required for most cellular processes. So, the correct answer is option B. Vitamin B2 deficiency leads to Pellagra, which is caused by Niacin (Vitamin B3) deficiency, not Vitamin B2.