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: Skin
[{'content': 'A 30 year old male presented with ulcerative lesion on glans penis. Wright- Giemsa stain showed 1-2 rounded structure in macrophage vacuoles. What is the etiology \nSelect and explain. \nA. Chlamydia trachomatis, B. N. gonorrhoea, C. H. ducreyi, D. Calymatobacterium granulomatis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Calymatobacterium granulomatis', 'role': 'assistant'}]