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': 'Regarding Brucellosis, all of these are true except- \nSelect and explain. \nA. Man to man transmission, B. A zoonosis, C. Blood cultures used in diagnosis, D. B melitensis is the most common cause', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]