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
True about Vitamin K 
Select and explain. 
A. It is required for synthesis of factor VII, B. Long term use of antimicrobials can cause deficiency of vitamin K, C. It is a water soluble vitamin, D. DVT is associated with vitamin K deficiency
B: Long term use of antimicrobials can cause deficiency of vitamin K
Answer: B: Long term use of antimicrobials can cause deficiency of vitamin K 
Explanation: None