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
[{'content': 'Which complement component is anaphylotoxin - \nSelect and explain. \nA. C3b, B. C5.-9, C. C5a, D. Cl-3', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., C5a", 'role': 'assistant'}]