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: Medicine
[{'content': 'Which of the following best denotes classical complement pathway activation in immuno inflammatory condition: \nSelect and explain. \nA. C2, C4 and C3 decreased, B. C2 and C4 normal, C3 is decreased, C. C3 normal and C2, C4 decreased, D. C2, C4, C3 all are elevated', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (C2, C4 and C3 decreased): The final outcome of both the pathways is formation of membrane attack complex , which causes lysis of cells.', 'role': 'assistant'}]