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: Physiology
[{'content': 'Haemostasis depends upon all the following, EXCEPT \nSelect and explain. \nA. Calcium, B. Prothrombin, C. Vitamin B, D. Vitamin K', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]