This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: mycology, Subject name: Microbiology
Which of the following Aspergillus species produce black coloured colonies on sabaraud's dextrose agar? 
Select and explain. 
A. A fumigatus, B. A niger, C. A flavus, D. None
B: A niger
Answer: B: A niger 
Explanation: Aspergillus fumigatus produce green colonies A niger -black colonies A flavus-golden-yellow colonies Ref: Baveja 5th ed pg: 559