This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Anatomy
[{'content': 'Which of the following pigment is only produced by Psedomonas aeruginosa? \nSelect and explain. \nA. Pyoverdin, B. Pyorubin, C. Pyocyanin, D. Pyomelanin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pseudomonas produces a number of pigments which diffuse freely into surrounding, inhibit other bacteria and mediate tissue injury. Pyocyanin is a blue green pigment produced only by P. aeruginosa', 'role': 'assistant'}]