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': 'Nocardia can be differentiated from other Actinomyces by ? \nSelect and explain. \nA. ZN staining, B. Fontana stain, C. Gram staining, D. All', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., ZN staining", 'role': 'assistant'}]