This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
Menadione is an analogue of 
Select and explain. 
A. Vitamin C, B. Vitamin A, C. Vitamin D, D. Vitamin K
D: Vitamin K
Answer: D: Vitamin K 
Explanation: ref: Ganong&;s review of medical physiology; 24th edition; page no;492 menadione C11H8O2(2-methyl-1,4-naphthoquinone) A compound used as a vitamin K supplement; impoant in blood clotting.