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
A patient of thrombosis if veins has been receiving coumarin therapy for three years. Recently she developed bleeding tendency .how will you reverse the effect of coumarin therapy 
Select and explain. 
A. Protamine injection, B. Vitamin K injection, C. Infusion of fibrinogen, D. Whole blood transfusion
B: Vitamin K injection
Answer: B: Vitamin K injection 
Explanation: Refer KDT 6/e p602 Vitamin k is used to reverse bleeding tendancy in warfarin overdose whereas fresh frozen plasma is treatment of choice for bleeding due to warfarin