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: Medicine
[{'content': 'Most of the pseudomonas infection is based on oppounism. The exception is: \nSelect and explain. \nA. Glanders, B. Pneumonia, C. Otitis media, D. Skin infection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The pseudomonas: They are heterogeneous group of gram-negative bacteria Common feature among them is the inability to ferment lactose. There are three medically impoant genera--Pseudomonas, Burkholderia, and Stenotrophomonas The pathogenicity of most is based on oppounism; the exceptions are the organisms that cause melioidosis (B. pseudomallei) and glanders (B. mallei) P. putida, P. fluorescens, and P. stutzeri infect humans rarely Ref: Harrison, E-18, P-1266.', 'role': 'assistant'}]