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
Nocardia can be differentiated from other Actinomyces by ? 
Select and explain. 
A. ZN staining, B. Fontana stain, C. Gram staining, D. All
A: ZN staining
Answer: A: ZN staining 
Explanation: Ans. is 'a' i.e., ZN staining