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': 'All of the following statements are true, except ? \nSelect and explain. \nA. Medulla is thin and fragmented in human hair, B. Medullary index > 0.5 in animal hair, C. Cortex is thin in human hair, D. Animal hair is coarse and thick', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Human hair :\n\nCortex is thick\nMedulla is thin and fragmented\xa0\nMedullary index < 0.3', 'role': 'assistant'}]