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
Donovanosis, true is 
Select and explain. 
A. Caused by Calymmatobacterium granulomatis, B. Lymphadenopathy is remarkable & diagnostic, C. Penicillin is drug of choice, D. Characterized by painful genital ulcers
A: Caused by Calymmatobacterium granulomatis
Answer: A: Caused by Calymmatobacterium granulomatis 
Explanation: None