Which of the following organism is black in color?
 
A)     Stachybotrys
B)     Penicillium
C)     Geotrichum
D)     Chaetomium
 
The correct answer is (A) Stachybotrys.
The color of the Stachybotrys mold is black. Some other fungi can also produce the black mold like Aspergillus etc.