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': 'Choose the right combination: \nSelect and explain. \nA. Gram staining - Gram negative bacilli, B. Gram staining - Mycobacterium tuberculosis, C. Z N staining - Mycobacterium tuberculosis, D. Z N staining - Gram negative bacilli', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Z.N. staining - Mycobacterium tuberculosisImage description - Z.N. staining of smear showing long slender, beaded, red colored acid fast bacilli with numerous pus cells against blue background.", 'role': 'assistant'}]