This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Nocardia is differentiated from Actinomyces by: \nSelect and explain. \nA. Gram stain, B. ZN stain, C. Nocardia causes mycetoma, Actinomyces do not, D. Nocardia is facultative anaerobe', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Ziehl Neelsen stainRef: (Ananthanarayan, 8th/e, p. 393; 9th/e, p. 394; Harrison, 18th/e, p. 1324; Jawetz, 24th/e, p. 182)Nocardia - Partially acid fast, obligate aerobe, habitat is soil and infections occur exogenously.Actinomyces - Nonacid fast, facultative anaerobe, habitat is oral flora so infections occur endogenously.", 'role': 'assistant'}]