This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2017, Subject name: Microbiology
1-3 beta - d - glucan assay is done for which infection? 
Select and explain. 
A. Invasive candidiasis, B. Cryptococcus, C. Penicillium, D. Rhinicerebral mucormycosis
A: Invasive candidiasis
Answer: A: Invasive candidiasis 
Explanation: Beta-d- glucan is an attractive antigen in that it is found in a broad range of fungal agents, including the commonly encountered agents Candida spp., Aspergillus spp., Pneumocystis jirovecii. Cryptococcus- capsular antigen detection from CSF or serum by latex agglutination test is a rapid and sensitive test. Pneumocystis carinii- no serological test available Mucormycosis- Can be diagnosed by KOH mount showing , non-septated hyphae branching at obtuse angle