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': 'Staphylococcus is - \nSelect and explain. \nA. Gram - positive cocci, B. Gram - negative cocci, C. Gram - positive bacillus, D. Gram - negative bacillus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Gram - positive cocci Gram positive bacteria . There are 6 classic grain positive bacteria that cause human disease. . Of these 2 are cocci Staphylococci Streptococci (including anaerobic peptostreptococci) . Other 4 are bacilli Corynebacterium 3. Clostridium Bacillus 4. Listeria", 'role': 'assistant'}]