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: Surgery
[{'content': 'During an attempted extraction of upper posterior teeth, to determine the position of the roots displaced into antrum, ideal radiograph would be \nSelect and explain. \nA. Bitewing radiography of maxillary posteriors, B. IOPA of mandibular posterior teeth, C. Upper oblique occlusal radiograph, D. Lateral oblique view of mandibular posteriors', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]