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: Dental
A 30-year-old male patient has a large, spreading and exuberant ulcer with bright red granulation tissue over the glans penis. There was no lymphadenopathy. The most likely causative organism is – 
Select and explain. 
A. Treponema pallidum, B. Herpes simplex virus type 1, C. Herpes simplex virus type 2, D. Calymmatobacterium granulomatis
D: Calymmatobacterium granulomatis
Answer: D: Calymmatobacterium granulomatis 
Explanation: Two important clues in this question are :-


Exuberant granulation tissue → Diagnosis is granuloma venerum
No lymphadenopathy → Diagnosis is granuloma venerum