Q: Which of the following is a steroid hormone?  

Answer: D

Steroid hormones are derived from cholesterol and are composed of four rings of carbon atoms. Testosterone and relaxin are two examples of steroid hormones. Testosterone is a male sex hormone that is produced in the testes and is responsible for the development of male secondary sexual characteristics. It also plays a role in sperm production and libido. Relaxin is a hormone that is produced in both males and females, but it is more commonly associated with females. It is produced by the ovaries during pregnancy and is responsible for relaxing the ligaments and joints in the pelvis, which allows for easier delivery of the baby during childbirth.

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