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: Medicine
Which are the terminal component of the complementary system? 
Select and explain. 
A. C6,C7,C8, B. C7,C8,C9, C. C3,C4,C5, D. C5,C6,C7
B: C7,C8,C9
Answer: B: C7,C8,C9 
Explanation: Terminal components are C7, C8, and C9.They can directly kill some bacterial invaders (notably, many of the neisseriae) by forming a membrane attack complex and disrupting the integrity of the bacterial membrane, thus causing bacteriolysis. Ref: Harrison's Principles of Internal Medicine, 18e, Chapter 119.Introduction to Infectious Diseases.