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': 'Presence of Crytosporidium in a stool sample is identified using \nSelect and explain. \nA. Modified acid fast staining, B. Iodine staining, C. Warthin Starry stain, D. Iron haematoxylin stain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]