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: Anatomy
The roof of the olfactory region is formed by ? 
Select and explain. 
A. Nasal bone, B. Cribriform plate of ethmoid, C. Sphenoid, D. Temporal bone
B: Cribriform plate of ethmoid
Answer: B: Cribriform plate of ethmoid 
Explanation: Ans. is 'b' i.e., Cribriform plate of ethmoid The olfactory mucosa lines the upper one-third of nasal cavity including the roof formed by cribriform plate and the medial and lateral walls up to the level of superior concha (turbinate).