Which one of the following pairs is not correctly matched?

Deficiency of vitamin B12 can potentially cause severe and irreversible damage, especially to the brain and nervous system. Vitamin B12 deficiency results from atrophic gastritis- thining of stomach lining, Pernicious anemia, which makes it hard for your body to absorb vitamin B12. Deficiency of Vitamin B6 is associated with microcytic anemia, electroencephalographic abnormalities, dermatitis with cheilosis, swelling of the tongue etc. This can result from celiac disease, Crohn's disease, and ulcerative colitis. Even certain genetic diseases such as homocystinuria and protein-energy undernutrition can also cause vitamin B6 deficiency. Vitamin B1 deficiency is the lack of thiamine pyrophosphate, the active form of the vitamin known as thiamine. This causes thiamine deficiency also known as beriberi. Vitamin B3 is also called as niacin and its deficiency causes pellagra. Thus, the correct answer is option B.