This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': '.All are catalase positive except \nSelect and explain. \nA. S. flexneri, B. S. boydii, C. S. dysenteriae type I, D. S. sonnei', 'role': 'user'}, {'content': 'Answer: C \nExplanation: All bacteria among the Enterobacteriaceae including Shigella species are catalase positive exceptShigella dysenteriae type I(Ref: Ananthanarayan 9th edition, p285)', 'role': 'assistant'}]