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
Donovanosis is caused by ? 
Select and explain. 
A. Calymmatobacterium granulomatosis, B. Legionella, C. Chlymadia, D. Rickettsia
A: Calymmatobacterium granulomatosis
Answer: A: Calymmatobacterium granulomatosis 
Explanation: Granuloma inguinale (also known as donovanosis) is a bacterial disease caused by Klebsiella granulomatis (formerly known as Calymmatobacterium granulomatis) characterized by ulcerative genital lesions.