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What is the bulb responsible for in hair structure?

  1. Regulating hair growth cycle

  2. Producing melanin pigment

  3. Secreting oils

  4. Filtering toxins

The correct answer is: Producing melanin pigment

While the bulb supports hair growth, it is not responsible for regulating the hair growth cycle. This function is primarily controlled by hormones and genetics. Additionally, the bulb does not secrete oils or filter toxins. These functions are carried out by the sebaceous glands and liver, respectively. Therefore, the bulb's primary responsibility in hair structure is producing the pigment melanin, which gives hair its color.