This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
Vitamin K dependent clotting factors are 
Select and explain. 
A. Factor IX and X, B. Factor IV, C. Factor XII, D. Factor I
A: Factor IX and X
Answer: A: Factor IX and X 
Explanation: Vitamin K-dependent clotting factors II, VII, IX, X, proteins C, and S,