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: Unknown
Waters view is best used for visualization of: 
Select and explain. 
A. Frontal sinus, B. Maxillary sinus, C. Ethmoid sinus, D. Sphenoid sinus
B: Maxillary sinus
Answer: B: Maxillary sinus 
Explanation: Ref. Textbook of Ear, Nose and Throat Diseases Pg 155
 

Law’s view (15º lateral oblique): Sagittal plane of the skull is parallel to the film and X-ray beam is projected 15 degrees cephalocaudal
Water view – Best to visualize maxillary sinus
The Caldwell view is a caudally angled PA radiograph of the skull, designed to better visualise the paranasal sinuses, especially the frontal sinus
Schuller’s or Rugnstrom view (30º lateral oblique): Similar to Law’s view but cephalocaudal beam makes an angle of 30 degrees instead of 15 degrees