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: Microbiology
[{'content': 'Staphyloccocal pathogenicity is indicated by? \nSelect and explain. \nA. Coagulase positivity, B. Hemolysis, C. Lipoteichoic acid, D. Endotoxin', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Coagulase positivity Virulence factors of staphylococcus aureus . There are numerous virulence factors responsible for pathogenicity of staph aureus, but the most consistent association of virulence is production of coagulase and to a lesser extent, fermentation of mannitol. Coagulase causes activation of prothromhin and leads to fibrin formation around the bacteria, protecting the bacteria from phagocytosis.", 'role': 'assistant'}]