This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Factor X is \nSelect and explain. \nA. Hageman factor, B. Stua-Prower factor, C. Christmas factor, D. Tissue factor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Factor X is also called as Stua-Prower factor Ref: Ganong 25th ed/page 566', 'role': 'assistant'}]