This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Likely cause of this manifestation is: \nSelect and explain. \nA. Candida, B. Pseudomonas, C. Staphylococcus aureus, D. Fusarium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diagnosis of this image is green nail syndrome. Paronychial infection that can develop in individuals whose hands are frequently submerged in water. Cause- Pseudomonas aeruginosa', 'role': 'assistant'}]