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
[{'content': 'Factor present in the final common terminal complement pathway is: \nSelect and explain. \nA. C4, B. C3, C. C5, D. Protein B', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The terminal pathway that is common to all pathways of the complement system leads to the membrane attack complex and consists of factors C5, C6, C7, C8 and C9 (C5b6789)', 'role': 'assistant'}]