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 colored colonies, likely organism is - 
Select and explain. 
A. Staphylococcus, B. Streptococcus, C. Pseudomonas, D. E. coli
C: Pseudomonas
Answer: C: Pseudomonas 
Explanation: “The optimum temperature for growth of Pseudomonas aeruginosa is 37 degree and is able to grow at temperature as high as 42° C ‘Essenals of Microbiology' Pseudomonas aeruginosa

 Morphology ÿ Gram-negative bacilli ÿ Mole by polar flagellum ÿNon capsulated but many strains have mucoid slim layer especially the organisms which are isolated from cysc fibrosis patient.
 Culture ÿObligate aerobe ÿ Colonies emit a distance, musty, mawkish, earthy or sweet grape-like odour or corn tacolike odour.

ÿ Cetrimide agar is a selective media. ÿ Pseudomonas aeruginosa produces a number of pigments.
The production of these pigments accounts for the colour of colonies. ÿ Pyocyanin is produced only by P. aeruginosa and it i