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: ENT
Caldwell view is done for 
Select and explain. 
A. Sphenoid sinus, B. Maxillary sinus, C. Ethmoid sinus, D. Frontal sinus
D: Frontal sinus
Answer: D: Frontal sinus 
Explanation: Caldwell view is the occipito frontal view. The frontal sinuses are seen clearly in this view.