This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
Warfarin to be stopped__ days before surgery 
Select and explain. 
A. 2 to 3 days, B. 4 to 5 days, C. 6 to days, D. 8 to 9 days
B: 4 to 5 days
Answer: B: 4 to 5 days 
Explanation: Warfarin should be stopped 4 to 5 days before surgery. clinical implication : to replenish coagulation factors. Monitor PT with INR* , aPTT,ACT. In emergency cases, give Inj.vitamin K., if bleeding continues give FFP,croprecipitate transfusions.