This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cryptocococcus, Subject name: Microbiology
[{'content': 'Cryptococcus neoformans is visualized by? \nSelect and explain. \nA. India ink preparation, B. Giemsa stain, C. Grams stain, D. Acid fast stain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) India ink preparationREF: Harrisons 18th ed chapter 202Visualization of the capsule of fungal cells in cerebrospinal fluid (CSF) mixed with india ink is a useful rapid diagnostic technique. Cryptococcal cells in India ink have a distinctive appearance because their capsules exclude ink particles', 'role': 'assistant'}]