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: Microbiology
[{'content': 'Donovanosis, true is \nSelect and explain. \nA. Caused by Calymmatobacterium granulomatis, B. Lymphadenopathy is remarkable & diagnostic, C. Penicillin is drug of choice, D. Characterized by painful genital ulcers', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]