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 is vitamin K–dependent clotting factor? \nSelect and explain. \nA. Factor VII, B. Factor I, C. Factor XI, D. Factor XII', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vitamin K-dependent factors are clotting factor II (prothrombin), VII, IX, and X and anti-clotting factors protein C and protein S.', 'role': 'assistant'}]