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': 'Which one of the following is a major component in activation of the complement alternative pathway: \nSelect and explain. \nA. C1, B. C2, C. C3, D. C4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - Alternate complement pathway Activators factor- Cobra venom , Properidin ,nephritic - C3b , Bb - C3 convease of alternate complement pathway - C5 - C9 is MAC (membrane attack complex) - C1,4,2 are not consumed in the alternate complement pathway', 'role': 'assistant'}]