This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Vitamin k is required for post translational modification of 
Select and explain. 
A. oxidation, B. carboxylation, C. methylation, D. Hydroxylation
B: carboxylation
Answer: B: carboxylation 
Explanation: The role of vitamin K is in the post-translational modification i.e, gcarboxylation of glutamic acid residues in proteins such as : Coagulation factors : Factor II, VII, IX, X Protein C and S Osteocalcin Nephrocalcin Reference: Harpers illustrated biochemistry 30th edition