This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Microbiology
[{'content': 'Classical complement activated by: \nSelect and explain. \nA. C1, B. C3 Convease, C. lgA, D. Ag - Ab complex', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Antigen-antibody complex lead to activation of classical complement pathway. MAC - Membrane attack complex (C5 - C9) MAC-attack on Antigen & make pores and finally antigen killed Alternate Complement pathway - staing from C3QQ Note : - Compliment 1,4,2 is by passed Lectin pathway sta from C4 C1 will not be consumed in lectin pathway', 'role': 'assistant'}]