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
[{'content': 'Waters view is best used for visualization of: \nSelect and explain. \nA. Frontal sinus, B. Maxillary sinus, C. Ethmoid sinus, D. Sphenoid sinus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref. Textbook of Ear, Nose and Throat Diseases Pg 155\n\xa0\n\nLaw’s view (15º lateral oblique):\xa0Sagittal plane of the skull is parallel to the film and X-ray beam is projected 15 degrees cephalocaudal\nWater view – Best to visualize maxillary sinus\nThe\xa0Caldwell view\xa0is a caudally angled PA radiograph of the skull, designed to better visualise the paranasal sinuses, especially the frontal sinus\nSchuller’s or Rugnstrom view (30º lateral oblique):\xa0Similar to Law’s view but cephalocaudal beam makes an angle of 30 degrees instead of 15 degrees', 'role': 'assistant'}]