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
Anticoagulant effect of Warfarin is increased by all of the following EXCEPT: 
Select and explain. 
A. Cimetidine, B. Phytonadione, C. Amiodarone, D. Phenylbutazone
B: Phytonadione
Answer: B: Phytonadione 
Explanation: Phytonadione is Vit K. It is used as an antidote in warfarin toxicity. From essential of medical pharmacology K D Tripati 7th edition Page no 613