This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
Sex differentiation from hair can be made by 
Select and explain. 
A. Length colour and texture, B. Coico medullary ratio, C. Epithelial cells of hair follicle, D. Scale type
C: Epithelial cells of hair follicle
Answer: C: Epithelial cells of hair follicle 
Explanation: Sexing of the human hair is possible by studying sex chromatin from the hair root cells of the scalp. Barr bodies are demonstrable in hair follicle in a propoion of 29 +- 5% in females and 6 +- 2% in males. Male hair are generally thicker, coarser and darker. Female hair are generally fine, long and gently taper to an end. Blood grouping and other serological criteria can be determined from the hair root cells. The cells of the hair root can also be used for DNA-profiling . Ref : Krishnan vij Textbook of Forensic medicine and Toxicology 5th edtion ; pg no - 54