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
Which of the following pigment is only produced by Psedomonas aeruginosa? 
Select and explain. 
A. Pyoverdin, B. Pyorubin, C. Pyocyanin, D. Pyomelanin
C: Pyocyanin
Answer: C: Pyocyanin 
Explanation: 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