During an office visit you notice a brown spot on the bottom of your patient's foot. You determine that it could be a fungal infection and take a sample to inspect under a microscope. Under the microscope you see many 2 celled oval yeast with short hyphae. Which is the likely diagnosis for this spot?
A. Black piedra
B. Tinea corporis
C. Tinea nigra
D. Tinea pedis