Which type of hair is androgen (testosterone) dependent and typically found on the face, ears, chest, and abdomen?

The correct response identifies sexual hair, which is notably influenced by androgens such as testosterone. This type of hair develops during puberty and is typically coarser and darker than other hair types. Sexual hair includes hair that appears on areas of the body that are associated with secondary sexual characteristics, such as the face, ears, chest, and abdomen. It responds significantly to hormonal changes, which is why it is categorized as androgen-dependent.

In contrast, other types of hair—such as body hair, vellus hair, and terminal hair—do not fit the specific characteristics or locations outlined in the question as directly related to androgen influence. Body hair can refer to all types of hair on the body and does not indicate androgen dependency specifically. Vellus hair is fine, light-colored, and usually found on areas of the body that are less affected by hormones. Terminal hair is indeed coarser and thicker and can also be influenced by hormones, but in the context of the question, sexual hair encompasses those specific areas and attributes better than terminal hair alone.