A microbiologist is reading the plates from a sputum culture. The culture is from a patient with cystic fibrosis. One organism dominates the blood agar, chocolate, and MacConkey plates. The MacConkey plate shows an organism with a green pigment and a metallic sheen. The probable identification for this organism is
A) Pseudomonas aeruginosa. B) Serratia marcescens. C) Chromobacterium violaceum. D) Prevotella melaninogenica.