This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Haemophilus, Yersinia, Spirochaetes, Ricketssia, Chlamydia, Mycoplasma and Miscellaneous Bacteria), Subject name: Microbiology
Bipolar staining is characteristic of - 
Select and explain. 
A. Yersinia pestis, B. Proteus mirabilis, C. Pseudomonas aeruginosa, D. All of the above
A: Yersinia pestis
Answer: A: Yersinia pestis 
Explanation: Option a, b, c, d Bipolar staining (safety pin appearance): with both ends densely stained and a clear central area of the bacteria. 1. Yersinia pestis 2. Vibrio parahaemolyticus 3. Calymmatobacterium (Donovania) granulomatis 4. H. Ducreyi 5. Pasteurella multocida 6. Burkholderia species