This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
[{'content': 'Which of the following are/is not an activator of alternate complement system? \nSelect and explain. \nA. Factor H, B. IgA, C. Bacteria, D. Toxin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Factor H(Ref: Robbins 9th/pg 162-164)The alternative pathway, can be triggered by microbial surface molecules (e.g., endotoxin, or LPS), complex polysaccharides, cobra venom, and other substances, in the absence of antibodyFactor I and H inhits complement activation', 'role': 'assistant'}]