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
C
3
 convertase acts on - 
Select and explain. 
A. C4b2b, B. C4b2B3 a, C. C4b, D. C3
D: C3
Answer: D: C3 
Explanation: None