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: Dental
Donovanosis is caused by – 
Select and explain. 
A. Calymmatobactor granulomatois, B. T. pertenue, C. Chlamydia trachomatis, D. H. ducreyi
A: Calymmatobactor granulomatois
Answer: A: Calymmatobactor granulomatois 
Explanation: Donovanosis (granuloma inguinale or granuloma venerum) is caused by calymmatobacterium granulomatis.