This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'All organisms shows bipolar staining except - \nSelect and explain. \nA. Calymmatobacter granulomatis, B. Y. pestis, C. Pseudomonas mallei, D. H. influenzae', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., H. influenzae Bipolar staining (safety pin appearance)o Some bacteria display a safety pin appearance due to the accumulation of dye at the poles of the cells,o This characteristic is called bipolar staining.o Bacteria showing bipolar staining are-1. Calymmatobacter granulomatis (Donovani granulomatis)4. Vibrio parahemolyticus2 Pseudomonas mallei5. Yersinia pestis3. Pseudomonas pseudomallei6. H. ducreyi", 'role': 'assistant'}]