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': 'Which bone is not useful for sex determination? \nSelect and explain. \nA. Pelvis, B. Skull, C. Clavicle, D. Femur', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Important bones used for sex determination are\xa0skull,\xa0mandible, pelvis,\xa0vertebra,\xa0femur', 'role': 'assistant'}]