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: Biochemistry
Both Vitamin K and C are involved in: 
Select and explain. 
A. The synthesis of clotting factors, B. Post translational modifications, C. Antioxidant mechanisms, D. The microsomal hydroxylation reactions
B: Post translational modifications
Answer: B: Post translational modifications 
Explanation: None