This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Human identification, Subject name: Forensic Medicine
[{'content': 'The medullary index of a human hair is \nSelect and explain. \nA. 0.2, B. 0.4, C. 0.5, D. 0.6', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Human hair Animal hair Fine thin Coarse & thick Cuticular scales are sho, not continuous Cuticular scales are large, step like projections Coex thick (4-10 times as broad as medulla) Coex thin Pigment more towards the periphery Pigment more towards the medulla Medulla thin & fragmented, sometimes absent Medulla broad, continuous & always present. Medullary index <0.3 Medullary index > 0.5 Precipitin test specific for human Precipitin test specific for animal', 'role': 'assistant'}]