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Coloring matter is found in the hair:

  1. medulla

  2. cuticle

  3. cortex

  4. follicle

The correct answer is: cortex

Coloring matter is mainly found in the cortex, which is the middle layer of the hair shaft. The medulla and cuticle do not contain coloring matter. The follicle is the part of the hair located beneath the skin and does not have coloring matter either. Therefore, option C is the correct answer.