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': 'Which amongst the following biological agents carries the least potential for use as a biological weapon for microbial terrorism? \nSelect and explain. \nA. Plague (Yersinia pestis), B. Small pox (variola major), C. Botulism (Cl. botulinum), D. Brucellosis (Brucella sp)', 'role': 'user'}, {'content': "Answer: D \nExplanation: Brucellosis (Brucella sp.) is classified as 'Category B' agent with second highest priority/potential for use as a biological weapon for microbial terrorism.\n\n\nPlague, smallpox and Botulism belong to 'Category A' as defined by CDC with the highest potential for use as biological weapons.", 'role': 'assistant'}]