Thyroid hormone is classified as a steroid.
a. true
b. false

a. True

Explanation:

Hormones are signaling molecules that are produced by endocrine glands. The role of hormones is to control physiology or behavior. They can be classified into three categories: 

Peptide hormones – derived from a chain of amino acids

Amino acid or fatty acid hormones – derived from an amino acid or lipids respectively

Steroids – derived from cholesterol

Thyroid hormones are considered steroids. They are produced by the thyroid gland and are responsible for regulating metabolism.

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explanation: