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
Pyoverdin is produced by : 
Select and explain. 
A. Pseudomonas aeruginosa, B. Clostridium perfringenes, C. Bacillus stearothermophilus, D. Salmonella typhi
A: Pseudomonas aeruginosa
Answer: A: Pseudomonas aeruginosa 
Explanation: Pyoverdin is green coloured diffusible pigment produce by Pseudomonas aeruginosa Other pigments are:- Pyocyanin - Blue Pyorubin - Red Pyomelanin - Black