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': 'Malignant pustule is caused by: \nSelect and explain. \nA. B. Anthracis, B. Leishmaniasia, C. Basal cell carcinoma, D. Pyoderma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) B. anthracis', 'role': 'assistant'}]