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
[{'content': 'Bisected pearls appearance on culture medium is seen in ? \nSelect and explain. \nA. Brucella, B. Bordetella, C. Haemophilus ducreyi, D. Pseudomonas', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Bordetella Bordetella are gram-negative, capsulated, fimbriated, nonmotile coccobacillus.They show bipolar metachromatic granules on staining with toluidine blue.", 'role': 'assistant'}]