This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
The pathogenic organism responsible for causation of Donovaniasis is- 
Select and explain. 
A. Chlamydia trachomatis, B. Calymmatobacterium granulomatis, C. Haemophilus ducreyi, D. Herpes simplex virus
B: Calymmatobacterium granulomatis
Answer: B: Calymmatobacterium granulomatis 
Explanation: Granuloma Inguinale (Donovanosis) Granuloma inguinale is a genital ulcerative disease caused by the intracellular gram-negative bacterium Klebsiella granulomatis (formerly known as Calymmatobacterium granulomatis) Ref Harrison20th edition pg 1078