This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
[{'content': 'A male patient presented with granulomatous penile ulcer. On Wright geimsa stain tiny organisms of 2 microns within macrophages seen. What is the causative organism? \nSelect and explain. \nA. LGV, B. Calymmatobacterium granulomatis, C. Neisseria, D. Staph aureus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Calymmatobacterium granulomatosis Investigations Tissue smearMade from a piece of crushed ulcer tissueStained with Giemsa or Leishman stainOrganisms appear as intracellular (in macrophages) "bipolar inclusions" - safety pin or telephone handle appearance.', 'role': 'assistant'}]