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
[{'content': 'An HIV positive female presents with an indurated ulcer over the tongue. Laboratory findings show growth in cornmeal agar at 20-degree Celsius, microscopy showing hyphae and growth in human serum at 37-degree celsius show budding yeasts. The probable cause is \nSelect and explain. \nA. Candida albicans, B. Histoplasmosis, C. Blastomycosis, D. Coccidioidomycosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Candidiasis is an oppounistic endogenous infection. Germ tube test - Candida albicans has the ability to form germ tubes within 2hrs when incubated in human serum at 37C. Chlamydospores- it develops in cornmeal agar at 20C at the end of pseudohyphae. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition .', 'role': 'assistant'}]