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': 'While taking bitewing radiograph, what should be the angulation to avoid overlapping of the cusps on the occlusal surface? \nSelect and explain. \nA. 20 degrees, B. 5 degrees, C. 10 degrees, D. 15 degrees', 'role': 'user'}, {'content': "Answer: C \nExplanation: Bitewing or interproximal radiographs include the crowns of the maxillary and mandibular teeth and the alveolar crest on the same film. The beam is angulated +7 to +10 degree vertically to preclude overlap of the cusps on the occlusal surface.\nVertical angulation:\xa0\nThe aiming cylinder is positioned about +10 degrees to project the beam parallel with the occlusal plane (occlusal dentinoenamel junction). This orientation minimizes overlapping of the opposing cusps onto the occlusal surface and thus improves the probability of detecting early occlusal lesions at the dentinoenamel junction.\nRef:\xa0White\xa0and\xa0Pharoah's Oral\xa0Radiology,Principles\xa0and\xa0Interpretation 8TH\xa0EDITION", 'role': 'assistant'}]