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Vitamin K, also known as phylloquinone or the anti-haemorrhagic factor, is essential for normal blood clotting. A deficiency in this vitamin can lead to excessive bleeding even from small injuries.

1. Vitamin B3, also called niacin, is a component of NAD. The corpus luteum is a temporary endocrine gland formed from a ruptured Graafian follicle.
2. The Bundle of His is a structure in the heart's conduction system that transmits impulses from the atria to the ventricles.
3. Sebum refers to the oily substance secreted by sebaceous glands in the skin.
4. Vitamin D

Correct answer: Vitamin D

Solution

Vitamin K is specifically referred to as the anti-haemorrhagic factor or phylloquinone, and its deficiency leads to delayed blood clotting. Among the options, Vitamin D is unrelated to this function, making it the correct answer.

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