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
Which bacteria show this kind of growth pattern in Ghee broth 
Select and explain. 
A. Yersinia Pestis, B. Acinetobacter, C. Aeromonas, D. Nocardia
A: Yersinia Pestis
Answer: A: Yersinia Pestis 
Explanation: In ghee broth , Yersinia pestis shows a characteristic growth which hangs down into broth from the surface , resembling stalactites ( stalactite growth )