Discussion
Human hair when examined under microscope will reveal
Answer: A
Human hair under the microscope shows a thick cortex and a thin medulla. The medulla is thin and often absent or fragmented, and the medullary index, the ratio of the diameter of the medulla to that of the hair, is generally below one third.
A thin cortex with a thick medulla is typical of many animal hairs, such as those of a rabbit or cat, which have a wide medulla. Equal thickness of cortex and medulla is also not typical of human hair. So option A is correct and None of the above is not.
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