Discussion
Consider the following statements:
1. Vitamin 'X' plays an important role in blood clotting.
2. Xerophthalmia is a condition caused by Vitamin 'Y' deficiency that dries the cornea and mucous membrane of the eye.
Identify X and Y (respectively).
Answer: D
X and Y are vitamins K and A.
Vitamin K is needed by the liver to make clotting factors such as prothrombin; its deficiency causes prolonged bleeding. Deficiency of vitamin A causes night blindness and xerophthalmia, in which the conjunctiva and cornea become dry and may ulcerate.
Vitamin \(B_{12}\) deficiency causes pernicious anaemia, vitamin C deficiency causes scurvy, and vitamin D deficiency causes rickets, so the other pairs are wrong.
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