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
Level of which clotting factor falls first after giving warfarin? 
Select and explain. 
A. V, B. VI, C. VII, D. VIII
C: VII
Answer: C: VII 
Explanation: Ans. is 'c' i.e., VII