The answer is the hair follicle. It's the pocket in the skin, not the hair itself.
People mix this one up because the hair bulb sits right inside the follicle, so the two get treated like synonyms on test day. They're not: the follicle is the structure in the skin, the bulb is the club-shaped base of the hair strand sitting inside that structure. The dermal papilla and arrector pili are separate structures entirely — the papilla feeds the bulb, and the arrector pili is the tiny muscle that makes hair stand up.
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