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 are pneumatization patterns ot sphenoid sinus except: 
Select and explain. 
A. Pre sellar, B. Post sellar, C. Concha bullosa, D. Conchal
C: Concha bullosa
Answer: C: Concha bullosa 
Explanation: Three types of sphenoid sinus pneumatization patterns have been found.Pneumatisation patterns depend on the position of thr sinus in relation to the sella turcica. Ref Dhingra 6/e,p 188.