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': 'Which of the following is acid-fast organism? \nSelect and explain. \nA. Mycoplasma, B. Actinomycetes, C. Nocardia, D. Chlamydia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c (Nocardia). (Ref. Textbook of Microbiology by Anantanarayan, 6th/371)FOLLOWING ARE ACID FAST STAINING POSITIVE1. M.Tb2. Nocardia3. Bacterial spores4. Lipofuschin pigment5. M. leprae6. Cryptosporidium', 'role': 'assistant'}]