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: Skin
Donovanosis/granuloma venerum is caused by 
Select and explain. 
A. Calymatobacter granulomatis, B. T. peenue, C. Chlamydia Trachomatis, D. H. ducreyi
A: Calymatobacter granulomatis
Answer: A: Calymatobacter granulomatis 
Explanation: A i.e. Calymatobacter granulomatis