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': 'Which of the following complement component can be activated in both common as well as alternate pathways? \nSelect and explain. \nA. C1, B. C2, C. C3, D. C4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The complement proteins can be activated by 3 pathways;\nClassical,lectin and alternate pathways. Terminal pathway is common to the first three pathways and is present ar the level of the post-activation stage of C3. It eventually leads to the membrane attack complex that lyses cells.', 'role': 'assistant'}]