This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Identification, Subject name: Forensic Medicine
[{'content': 'Commonly used long bone for identification - \nSelect and explain. \nA. Femur, B. Radius, C. Ulna, D. Humerus', 'role': 'user'}, {'content': "Answer: A \nExplanation: The best long bone for identification is femur. Ref: K.S.Narayan Reddy's synopsis of Forensic Medicine and Toxicology 29 th edition Chapter 4 page,43,45.", 'role': 'assistant'}]