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': 'All the following regarding histoplasmosis are true except - \nSelect and explain. \nA. Very rare in patients with AIDS, B. Bone marrow is involved, C. Gomori Methenamine silver stain used, D. Dimorphic fungi', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]