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
Most chemotactic propey is with ? 
Select and explain. 
A. C3a, B. C5a, C. C5-9, D. C3b
B: C5a
Answer: B: C5a 
Explanation: Ans. is `b' i.e., C5a C is a powerful chemotactic agent.