This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of skin, Subject name: Dental
[{'content': 'Medullary index of Human hair is \nSelect and explain. \nA. 1:01, B. 1:02, C. 1:03, D. 1:05', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Medullary index has been in use for determining the species origin of hair; the index is 0.3 or less in human hairs; in animals it is more than 0.3. Ref:- Review of Dermatology by Alikhan; pg num:-11', 'role': 'assistant'}]