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
The biochemical role of vitamin K in the post translational modification of clotting factors is by : 
Select and explain. 
A. Glycosylation, B. Carboxylation, C. Acetylation, D. Phosphorylation
B: Carboxylation
Answer: B: Carboxylation 
Explanation: None