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
The following are essential components of the intrinsic coagulation system -a) Pre-kallikreinb) High molecular weight kininogenc) Factor VIId) Tissue factore) Factor X 
Select and explain. 
A. abe, B. bcd, C. cde, D. acd
A: abe
Answer: A: abe 
Explanation: None