This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vibrio, Subject name: Microbiology
[{'content': 'The following gram stain shows which bacteria? \nSelect and explain. \nA. Streptococcus pneumonia, B. Staphylococcus aureus, C. Listeria monocytogenes, D. Vibrio cholera', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Vibrio cholera.* The following picture shows presence of Vibrio cholera in gram Stain. Notice that the Long arrow points to a curved gram-negative rod. Arrowhead points to a flagellum at one end of a curved gram-negative rod.Image source- style="font-family: Times New Roman, Times, serif">', 'role': 'assistant'}]