This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Which complement component is anaphylotoxin - 
Select and explain. 
A. C3b, B. C5.-9, C. C5a, D. Cl-3
C: C5a
Answer: C: C5a 
Explanation: Ans. is 'c' i.e., C5a