An HIV positive female has an indurated ulcer over the tongue

An HIV positive female has an indurated ulcer over the tongue. Laboratory findings show growth in cornmeal agar at 20 Degrees, microscopy showing hyphae and growth in human serum at 37 degrees show budding yeasts. The probable cause is


a)Candida albicans  
b)Histoplasmosis  
c)Blastomycosis  
d) Coccidiodomycosis


Ans (a)