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: Microbiology
Red pigment producing bacteria is 
Select and explain. 
A. Escherichia coli, B. Bordetella parapeussis, C. Pseudomonas aeruginosa, D. Serratia marcescens
D: Serratia marcescens
Answer: D: Serratia marcescens 
Explanation: Serratia forms characteristic pink,red or magenta non diffusible pigment called prodigosin which is optimally formed at room temperature. Ref: anantnarayan and panikers 10 th edition