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': 'Nocardia can be differentiated from other Actinomyces by \nSelect and explain. \nA. ZN staining, B. Fontana stain, C. Gram staining, D. Oxygen requirement', 'role': 'user'}, {'content': "Answer: A \nExplanation: Actinomyces - on ZN staining- central pa as non-acid fast surrounded by acid-fast clubs( antigen-antibody complex ). Nocardia- on ZN staining - acid-fast. Nocardia species are aerobic. Reference: Textbook of Microbiology; Ananthanarayan and paniker's; 10th edition; Pg: 398", 'role': 'assistant'}]