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: Pathology
[{'content': 'The only Species of Shigella that produces exotoxin \nSelect and explain. \nA. Shigella sonnei, B. Shigella flexneri, C. Shigella boydii, D. Shigella dysenteriae', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]