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
[{'content': 'Red pigment producing bacteria is \nSelect and explain. \nA. Escherichia coli, B. Bordetella parapeussis, C. Pseudomonas aeruginosa, D. Serratia marcescens', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]