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': 'Best technique to locate an impacted maxillary canine? \nSelect and explain. \nA. Occlusal radiograph, B. Periapical radiograph with tube shift technique, C. CBCT, D. OPG', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]