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': 'Complement complex that attacks cell membrane is \nSelect and explain. \nA. C12345, B. C23456, C. C34567, D. C56789', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The complement complex attacking the cell membrane is membrane attack complex having a composition of C56789\nAction of this complex leads to entry of fluid and ions inside the cells leading to cell lysis.\n\tComplement system has three main function\n\t1. Inflammation\n\t2. Opsonization\n\t3. Cell lysis', 'role': 'assistant'}]