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
[{'content': 'The pathogenic organism responsible for causation of Donovaniasis is- \nSelect and explain. \nA. Chlamydia trachomatis, B. Calymmatobacterium granulomatis, C. Haemophilus ducreyi, D. Herpes simplex virus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]