If vellus hair is stimulated to grow deeper and coarser, it is referred to as which of the following?

When vellus hair is stimulated to grow deeper and coarser, it is referred to as accelerated vellus hair. Vellus hair is the fine, soft hair typically found on the human body, and when it undergoes a transformation to become thicker or deeper, it signifies an increase in its robustness and visibility. This change often occurs due to various factors such as hormonal influences, particularly androgens, which can lead to the activation and alteration of hair follicles. The term "accelerated" effectively describes the enhanced growth and density of the hair, indicating a shift from its natural state to a more pronounced form.

The other options might evoke concepts related to hair growth but do not specifically capture the phenomenon of vellus hair becoming coarser or more prominent. Thickened vellus hair does not encompass the nuanced process involved in the transformation, while transformed terminal hair refers specifically to vellus hair transitioning to a totally different hair type—terminal hair—characterized by its thicker and darker quality. Enhanced androgenic hair could imply a general increase in hair growth due to androgens but lacks the precision needed to describe vellus hair specifically being transformed in a way that deepens and thickens it.