This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Activator of alternative complent pathway - \nSelect and explain. \nA. Antigen-Antibody complex, B. Mannose-binding lectin, C. Bacterial surface polysaccharide, D. All of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Bacterial surface polysaccharide o There are four pathways of complement system1) The classical activation pathway activated by antigen / antibody immune complexes.2) The mannose - binding lectin activation pathway activated by microbes with mannose terminal groups.3) The alternative activation pathway activated by microbes or tumor cells.4) The terminal pathway that is common to first three pathways and leads to the membrane attack complex that lyses cells.Microbial surface polysaccharide / lipopoly sacchoride (including endoxin) activates alternative pathway.", 'role': 'assistant'}]