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': 'The” STRING OF PEARL “ colonies on nutrient agar is produced by- \nSelect and explain. \nA. klebsiella, B. proteus, C. bacillus, D. salmonella', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]