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
Pigment producing colonies are seen in- 
Select and explain. 
A. Pseudomonas, B. Atypical mycobacteria, C. Serratia marcescens, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None