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: Biochemistry
[{'content': 'Vitamin K dependent clotting factor is \nSelect and explain. \nA. VII, B. I, C. XI, D. XII', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vitamin K dependent clotting factors (VKCF) are clotting factors II (prothrombin), VII (Proconvertin), IX (Christmas factor), X (Stuart Prover Factor), protein C, protein S and protein Z.', 'role': 'assistant'}]