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': 'In humans, coex of hair is usually: \nSelect and explain. \nA. Double that of medulla, B. Same as medulla, C. 4-10 times broader than the medulla, D. Thin in comparison to medulla', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. 4-10 times broader than the medulla', 'role': 'assistant'}]