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': 'Mode of transmission of Brucella is ? \nSelect and explain. \nA. Air, B. Water, C. Milk, D. Aerosol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]