This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
A diabetic patient has black necrotic mass in nose, most likely causes is: 
Select and explain. 
A. Mucormycosis, B. Aspergillus, C. Histoplasmosis, D. Candidiasis
A: Mucormycosis
Answer: A: Mucormycosis 
Explanation: Ans. is 'a' i.e.Mucormycosis Mucormycosis is a fungal infection of nose and paranasal sinuses which may prove rapidly fatal if untreated.lt is seen in uncontrolled diabetes or in those taking immunosuppressive drugs.Treatment is by amphotericin B* and surgical debridement.Remember :Most common fungal infection of nose is Aspergillosis *Rhinosclerosis is caused by a bacteria Klebsiella * (& not by Rhinosporidium Seeberi, a fungus )Otomycosis is caused by Aspergillosis*