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: Forensic Medicine
[{'content': 'The age of a 16 years old female is best determined by the radiograph of - \nSelect and explain. \nA. Lower end of radius and Ulna, B. Upper end of humers, C. Upper end of radius and ulna, D. Xiphisternum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]