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': 'Which of the following factors are activated by vitamin K \nSelect and explain. \nA. Factor II, B. Protein C, C. Protein S, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Vitamin K activates clotting factors like factor II, VII, IX and X. It also activates anti - clotting proteins like Protein C & Protein S.', 'role': 'assistant'}]