What organism causes Glanders?

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Glanders is caused by a specific Gram-negative bacterium that belongs to the Burkholderia genus; in older naming this organism was called Pseudomonas mallei. The disease classically affects horses and can be transmitted to humans through close contact with infected animals or contaminated materials. The reason this option is the best choice here is that glanders is uniquely linked to this particular pathogen, whereas the other organisms listed are associated with different infections (for example, Pseudomonas aeruginosa is a common opportunistic pathogen in humans, Burkholderia cepacia is a notable CF pathogen, and Escherichia coli is a widespread cause of GI and other infections). Modern taxonomy uses Burkholderia mallei, but many exam questions still present the historical name Pseudomonas mallei, which is why this option appears as the correct one.