This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2019, Subject name: Microbiology
All the following mycobacteria produces pigment except: 
Select and explain. 
A. M. kansasii, B. M. simiae, C. M. Avium, D. M. scrofulaceum
C: M. Avium
Answer: C: M. Avium 
Explanation: Runyon Classification-