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': 'Best specimen of bone for sex determination is : \nSelect and explain. \nA. Femur, B. Pelvis, C. Skull, D. Mandible', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Pelvis', 'role': 'assistant'}]