Deficiency of Vitamin- causes
a)	Cheilosis	b)	Thalassemia	c)	Beri-beri	d)	Pernicious anaemia

(d)

Cyanocobalamin or vitamin-  is obtained from milk, egg, liver, fish and also synthesized by some colon bacteria. The deficiency (hypovitaminosis) of vitamin-  or cyanocobalamine causes pernicious anaemia, demyelination of never fibres and glossitis (inflammation of tongue).