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
[{'content': 'Central component of complement system is? \nSelect and explain. \nA. C3a, B. C3b, C. C4, D. C5', 'role': 'user'}, {'content': "Answer: D \nExplanation: C5 REF: Robbin's 8th ed p. 59Terminal pathway which is common to all the activation pathways stas with C5 and hence it is the central component of the complement system", 'role': 'assistant'}]