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: Microbiology
Central component of complement system is? 
Select and explain. 
A. C3a, B. C3b, C. C4, D. C5
D: C5
Answer: D: C5 
Explanation: C5 REF: Robbin's 8th ed p. 59Terminal pathway which is common to all the activation pathways stas with C5 and hence it is the central component of the complement system