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': 'Absent fragmented medulla of hair is seen in all except: \nSelect and explain. \nA. Mongols, B. Negroid, C. Causcasions, D. Servocrotarians', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Negros', 'role': 'assistant'}]