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: Radiology
Waters projection is useful for evaluating 
Select and explain. 
A. Frontal and ethmoidal sinuses, B. Zygomaticofrontal suture and nasal cavity, C. Maxillary sinuses, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Waters view, is optimal for visualization of the maxillary sinus, especially to compare internal radiopacities, as well as the frontal sinuses and ethmoidal air cells, when the mouth is open. The sphenoidal sinus is also seen. This view shows the roof, medial walls and allows the comparison of both the maxillary sinuses.