Diseases caused by the deficiency of vitamin D(X) and vitamin B₂(Y) are

	X	Y
1)	Scurvy	Cheilosis
2)	Rickets	Cheilosis
3)	Rickets	Scurvy
4)	Scurvy	Convulsions

vitamin D deficiency in children include rickets, in this disease long, soft bowed legs and flattening of the back of the skull is observed.

Riboflavin, or vitamin B2, helps to release energy from foods, promotes good. Cheilosis is swelling and fissuring of the lips which is result of this vitamin deficiency.