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
[{'content': 'True about Vitamin K \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]