This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
The most common cause of fungal sinusitis is( REPEAT QUESTION) 
Select and explain. 
A. A fumigates, B. A niger, C. A flavus, D. Candida
A: A fumigates
Answer: A: A fumigates 
Explanation: Fungal infections of the paranasal sinuses are uncommon and usually occur in individuals who are immunocompromised. Aspergillus fumigatus is most commonly involved in allergic fungal sinusitis and sinus mycetoma. (Ref: Textbook of diseases of ENT, PL DHINGRA, 7th edition, pg no. 220)