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 in alternate complement pathway - 
Select and explain. 
A. C4b2a, B. C3b, C. C3bBb, D. C3a
C: C3bBb
Answer: C: C3bBb 
Explanation: None