This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
68-year-old chandu is a diabetic and presented with black, foul, smelling discharge from the nose. Examination revealed blackish discoloration of the inferior turbinate. The diagnosis is - 
Select and explain. 
A. Mucormycosis, B. Aspergillosis, C. Infarct of inferior turbinate, D. Foreign body
A: Mucormycosis
Answer: A: Mucormycosis 
Explanation: Mucormycosis is a fungal infection of the nose and paranasal sinuses which may prove rapidly fatal if untreated. It is seen in uncontrolled diabetics or in those taking immunosuppressive drugs. From the nose and sinuses, the infection can spread to orbit, cribriform plate, meninges and brain.
The rapid destruction associated with the disease is due to the affinity of the fungus to invade the arteries and cause endothelial damage and thrombus. It presents as black necrotic mass filling the nasal cavity and eroding the septum and hard palate.