Safety pin appearance is shown by-a) Hemophilus ducreyib) Chlamydiac)  Donovani granulomatisd) Mycoplasma
Bipolar staining (safety pin appearance) 

Some bacteria display a safety pin appearance due to the accumulation of dye at the poles of the cells.


This characteristic is called bipolar staining.


Bacteria showing bipolar staining are-


Calymmatobacter granulomatis (Donovani granulomatis)
Pseudomonas mallei
Pseudomonas pseudomallei   
Vibrio parahemolyticus
Yersinia pestis
H.ducreyi
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b