This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Staphylococcal pathogenicity is indicated by \nSelect and explain. \nA. Coagulase positivity, B. Hemolysis, C. Lipoteichoic acid, D. Endotoxin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Staph infections are caused by staphylococcus bacteria, commonly found on the skin or in the nose of even healthy individuals. Most of the time, these bacteria cause no problems or result in relatively minor skin infections. The virulence factors of Staph aureus are: Cell-associated factors Cell-associated polymers Cell surface proteins EXTRACELLULAR ENZYMES: Coagulase Lipid hydrolases Hyaluronidase Nuclease Protein receptors TOXINS: Cytolytic toxins Enterotoxin Exfoliative toxin Ref: Textbook of Microbiology; Ananthanarayanan and Panicker; 10th Edition; Page No:203, 204', 'role': 'assistant'}]