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
You started a patient on oral warfarin. Which of the following factors show the most rapid decline in the blood levels after the initiation of warfarin therapy ? 
Select and explain. 
A. Factor VII, B. Protein C, C. Factor X, D. Prod-iron-Win
B: Protein C
Answer: B: Protein C 
Explanation: None