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: Microbiology
All organisms shows bipolar staining except ? 
Select and explain. 
A. Calymmatobacter granulomati, B. Y. pestis, C. Pseudomonas mallei, D. H. influenzae
D: H. influenzae
Answer: D: H. influenzae 
Explanation: Ans. is 'd' i.e., H. influenzae Safety pin appearance (Bipolar staining) yersinia pestis Vibrio parahemolyticus Burkholderia mallei Burkholderia pseduomallei Klebsiella granulomatis