Answer: Intracellular receptor
Explanation: Intracellular receptors are type of receptors found in the nucleus of a cell. Receptors are protein molecules to which a biological molecule or ligand binds to elicit biological response. Most receptors are present on the surface of a cell, this class of receptors are called extracellular or surface receptors. Intracellular receptors are receptors for steroid hormones and other water-insoluble hormones that can readily pass through the plasma membrane of their target cells through simple diffusion to reach their receptor proteins in the nucleus. A steroid hormone binds to a site on its specific receptor protein in the nucleus to form a hormone-receptor complex. The binding of the hormone triggers a conformational change in the receptor protein thereby enabling the binding of highly specific DNA sequences called hormone response element.