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
[{'content': 'Basal skull view (submentovertical view) X-ray is best to visualize – \nSelect and explain. \nA. Ethmoid sinus, B. Frontal sinus, C. Sphenoid sinus, D. Maxillary sinus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Best view for maxillary sinus\xa0→ Water's view (occipito-mental view)\nBest view for frontal sinus \xa0 \xa0 →\xa0 Caldwell view (occipito-frontal view)\nBest view for sphenoid sinus\xa0\xa0→\xa0\xa0 Basal view (submentovertical view)", 'role': 'assistant'}]