What type of hair is stimulated by androgens and found in the armpits and pubic area of both sexes?

The correct choice is terminal hair, which is a type of hair that is stimulated by androgens, the hormones related to male traits and reproductive activity. Terminal hair is characterized by being thicker, darker, and longer than other hair types. It is commonly found in areas of the body that are influenced by hormonal changes, such as the armpits and pubic region, in both males and females.

This increase in terminal hair growth during puberty is a result of the hormonal changes that occur in the body, leading to the development of secondary sexual characteristics. Vellus hair, on the other hand, is fine, soft hair that covers much of the body and is not significantly influenced by androgens. Lanugo is a very fine hair that typically appears on fetuses and is shed before birth, while ambisexual hair is not a recognized term in the study of hair types. Therefore, terminal hair is the most accurate description of the hair found in the specified areas of both sexes.