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': 'Bisecting angle technique is based on: \nSelect and explain. \nA. Geometric theorem, B. Imaging principle, C. Both of the above, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The\xa0bisecting-angle technique\xa0is\xa0based\xa0on\xa0a\xa0simple\xa0geometric\xa0theorem,\xa0 Cieszynski’s rule\xa0of\xa0isometry,\xa0which\xa0states\xa0that\xa0two\xa0triangles\xa0are\xa0equal\xa0when they share one complete side and have two equal angles.', 'role': 'assistant'}]