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 drugs can prolong bleeding except 
Select and explain. 
A. Cephalosporins, B. Multiple vitamin K tablets, C. Methylxanthines, D. Anti depressants
B: Multiple vitamin K tablets
Answer: B: Multiple vitamin K tablets 
Explanation: Vitamin K activates clotting factors 2,7, 9 & 10 and decreases chances of bleeding.