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
All of the following are diagnostic criteria of allergic Fungal sinusitis except: 
Select and explain. 
A. Areas of High Attuenuation on CT scan, B. Orbital invasion, C. Allergic eosinophilic mucin, D. Type 1 Hypersensitivity
B: Orbital invasion
Answer: B: Orbital invasion 
Explanation: Allergic fugal sinusitis is a non invasive form of fungal sinusitis as such orbital invasion is not its feature. Ref Pattern's Allergic Disease 6/e,p 778.