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: Pathology
[{'content': 'The following are essential components of the intrinsic coagulation system -a) Pre-kallikreinb) High molecular weight kininogenc) Factor VIId) Tissue factore) Factor X \nSelect and explain. \nA. abe, B. bcd, C. cde, D. acd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]