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
Type 1 diabetes mellitus patient presents with nasal septal and palatal perforation with brownish black nasal discharge probable diagnosis is: 
Select and explain. 
A. Rhinosporidiosis, B. Aspergillus, C. Leprosy, D. Mucormycosis
D: Mucormycosis
Answer: D: Mucormycosis 
Explanation: (d) Mucormycosis(Ref. Cummings, 6th ed., 733)Diabetic patient (immunocompromised), with local tissue destruction with brownish black nasal discharge is suggestive of mucormycosis. The black discharge is due to the angioinvasive nature of mucormycosis (leading to vascular thrombosis and gangrene formation).Invasive aspergillosis and leprosy also present with nasal septal and palatal perforation but black discharge does not occur.Rhinosporidiosis presents with blood tinged nasal discharge from red polypoid mass of sporangia (mulberry or strawberry appearance) and there is no local destruction.