Which of the following pairs is incorrect?

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(D) Rickets is caused by a deficiency of Vitamin $D$.Goitre is caused by a deficiency of Iodine.Beri-beri is caused by a deficiency of Vitamin $B_1$ (

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Colourblindness - Vitamin $A$

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(D) Rickets is caused by a deficiency of Vitamin $D$.Goitre is caused by a deficiency of Iodine.Beri-beri is caused by a deficiency of Vitamin $B_1$ (Thiamine).Colourblindness is a genetic disorder caused by mutations in the genes on the $X$ chromosome,not by a vitamin deficiency. Vitamin $A$ deficiency leads to night blindness,not colourblindness. Therefore,the pair 'Colourblindness - Vitamin $A$' is incorrect.

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