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': 'An abattoir worker presented with a malignant pustule on his hand that progressed to form an ulcer. The smear was taken from the ulcer and sent to a laboratory for investigation. The diagnosis is: \nSelect and explain. \nA. Cutaneous anthrax, B. Carbuncle, C. Ulcerating melanoma, D. Infected rodent ulcer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anthrax is a zoonoses, caused by Bacillus anthracis Q, that occurs primarily in herbivores Routes of Infection: Humans become infected when B.\nanthracis spores are introduced into the body by the following routes:\nContact with infected animals or contaminated animal products Q\nInsect bites Q\nIngestion Q\nInhalation Q\nThree major clinical forms in Humans:\nCutaneous Q (MC) Gastrointestinal (rare) Inhalational or pulmonary (it causes hemorrhagic pneumonia)', 'role': 'assistant'}]