This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
An organism grown on agar shows green coloured colonies; likely organism is: 
Select and explain. 
A. Staphylococcus, B. E.Coli, C. Pseudomonas, D. Peptostreptococcus
C: Pseudomonas
Answer: C: Pseudomonas 
Explanation: The above pigments account for the greenish colonies seen with psuedomonas. Ref: Text Book of Microbilogy By Ananthanarayan, 6th Edition, Page 294 ; Harrison's Principles of Internal Medicine, 14th Edition, Page 944