(A) Pernicious anemia is caused by the deficiency of vitamin $B_{12}$.The deficiency of vitamin $B_{1}$ causes Beri-beri.The deficiency of vitamin $B_

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(A) Pernicious anemia is caused by the deficiency of vitamin $B_{12}$.The deficiency of vitamin $B_{1}$ causes Beri-beri.The deficiency of vitamin $B_{6}$ causes convulsions.The deficiency of vitamin $B_{2}$ causes cheilosis (fissuring at corners of mouth and lips),digestive disorders,and a burning sensation of the skin.