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 vitamin C are involved in 
Select and explain. 
A. The synthesis of clotting factors, B. Post trasnslational modification, C. Antioxidant mechanisms, D. Microsomal hydroxylation reactions
B: Post trasnslational modification
Answer: B: Post trasnslational modification 
Explanation: Both vitamin C and vitamin K are required for post translational modification
Vitamin C is required for post translational modification of proline & lysine in collagen synthesis.
Vit K is required for post translational modification of glutamate residue or generation of clotting factors.