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Read the text carefully and choose the option that best summarizes its essence: The concept of Telogen effluvium is a common form of temporary hair loss that occurs after a major stressor or systemic shock to the body. This shock, which can range from severe illness or major surgery to extreme psychological distress or significant dietary changes, prematurely pushes a large number of growing hairs (anagen phase) into the resting phase (telogen phase). Typically, these resting hairs begin to shed approximately two to three months after the initial triggering event. Crucially, telogen effluvium is a reversible condition, and the hair follicles remain healthy, meaning full regrowth is expected once the underlying stress factor is resolved.