This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
[{'content': 'Donovanosis is caused by ? \nSelect and explain. \nA. Calymmatobacterium granulomatosis, B. Legionella, C. Chlymadia, D. Rickettsia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Granuloma inguinale (also known as donovanosis) is a bacterial disease caused by Klebsiella granulomatis (formerly known as Calymmatobacterium granulomatis) characterized by ulcerative genital lesions.', 'role': 'assistant'}]