This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
True about vitamin K- 
Select and explain. 
A. |ed synthesis of factor II, VII, IX & X, B. Doesn't require exposure to sunlight, C. Cause hemolytic anemia, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., |ed synthesis of factor II, VII, IX & X; 'b' i.e., Doesn't require exposure to sunlight; `c' i.e., Cause hemolytic anemia o Half life of vit K is 72 hours - Mahenderbhan Singh 5thie - 348 Vit K acts as a cofactor at a late stage in the synthasis of coagulation factors by liver - Prothrombin (factor II), Factor VII, IX and X (also protein 'C' & Protein 'S'). Vit K3 (Menadione) can cause hemolysis-contraindicated in G-6-PD deficiency and neonates. o Vitamin D requires sun exposure (not vitamin K).