Which stage describes a condition with no activity in the hair follicle?

The stage that describes a condition with no activity in the hair follicle is the telogen stage. During this phase, hair follicles are in a resting state, meaning there is no growth or activity occurring. The hair is fully formed and will eventually shed. This stage is crucial for the hair cycle, as it allows for new hair growth by clearing the old, inactive hair.

In contrast, the anagen stage is the active growth phase, where hair follicles are producing new hair. The catagen stage is a transitional phase that marks the end of the anagen stage, and while there is still some activity, it signals that hair growth is slowing down. The exogen phase involves the shedding of the hair, but the follicle is still somewhat active in preparing for the next anagen phase. Thus, telogen is specifically characterized by inactivity in the hair follicle, making it the correct answer.