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
Most common cause of fungal sinusitis is 
Select and explain. 
A. A. fumigatus, B. A niger, C. A flavus, D. Candida
A: A. fumigatus
Answer: A: A. fumigatus 
Explanation: Commonest cause of fungal sinusitis is Aspergillus fumigatusOther causes (Non-invasive form) - A.niger, A.flavus, CandidaNon-invasive fungal sinusitis presents as a fungal ball or allergic fungal rhinosinusitis (AFRS)Ref: Hazarika; 3rd ed; Pg 338