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
All of the following are anticoagulants, except : 
Select and explain. 
A. Phytonadione, B. Warfarin, C. LMW heparin, D. Lepirudin
A: Phytonadione
Answer: A: Phytonadione 
Explanation: None