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
Barrel-shaped arthroconidia are characteristic of which one of the following fungi? 
Select and explain. 
A. E. floccosum, B. C. immitis, C. Phialophora verrucosa, D. M. canis
B: C. immitis
Answer: B: C. immitis 
Explanation: Microscopic examination of fungal isolates is essential to the identification of the organism.C. immitis is a dimorphic fungus endemic in some regions of the south-western United States and in Latin America. In tissue, the organism exists as a spherule filled with endospores. When grown on solid media, the organism produces barrel-shaped arthroconidia, which stain with lactophenol cotton blue.