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
Nocardia can be differentiated from other Actinomyces by 
Select and explain. 
A. ZN staining, B. Fontana stain, C. Gram staining, D. Oxygen requirement
A: ZN staining
Answer: A: ZN staining 
Explanation: 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