<prompt> A HIV positive female presents with an indurated ulcer over the tongue. Laboratory findings show growth in cornmeal agar at 20 degree celcius, microscopy showing hyphae and growth in human serum at 37 degree celcius show budding yeasts. The probable cause is -Candida albicansHistoplasmosisBlastomycosisCoccidiodornycosis  <response>: Oral Thrush dt candida are common in HIV patients. CD4 cell count 300Oral Thrush presents as discrete coagulant adherent white plaques on the oral pharyngeal mucosa particularly in the mouth and on the tongue.All candida species pathogenic for humans grow rapidly at 25 to 37 on simple media as oval budding cells.In a special culture media and in tissue hyphae or elongated branching structures pseudohyphae are formed.All the other fungiHistoplasmaBlastomycosisCoccidioidomycosis do not cause oral thrush, neither do they form Pseudohyphae on culture media.In HIV ve patient the diagnosis of oral thrush is made by discet examination of a scraping for pseudohyphal elements. Culturing is of NO diagnostic value as patient may be ve cultures for landid in absence of thrush. 