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: Pathology
The most impoant meditor of chemotaxis among following is - 
Select and explain. 
A. C3b, B. C5a, C. C567, D. C2
B: C5a
Answer: B: C5a 
Explanation: Ans. is 'b' i.e., C5a