Martha, a 50-year-old mother of two, experiences fatigue and reduction in bone density. Her relationship with her husband develops a rift because of her reduced interest in sex. Which of the following hormones is Martha most likely lacking in?

A) orexin
B) melatonin
C) ibuprofen
D) testosterone

Bone Density

A measure of the amount of minerals (such as calcium) contained in a certain volume of bone, indicating its strength and risk for fracture.

Reduced Interest

A decrease in engagement or enthusiasm for activities or subjects that one previously found appealing or important.

Testosterone

A steroid hormone produced primarily in the testes in males and the ovaries in females, playing a key role in the development of male reproductive tissues and secondary sexual characteristics.