**Core Concept:** Androgen receptors are a type of nuclear receptor protein that play a crucial role in mediating the effects of androgens, such as testosterone, on various physiological processes in the body. Androgens are male sex hormones responsible for the development and maintenance of male characteristics. Androgen receptors are involved in cell growth, differentiation, and gene regulation.

**Why the Correct Answer is Right:** The C-terminal end of androgen receptors is essential for their interaction with androgen hormones. Specifically, this region is involved in the binding of androgens, allowing them to enter the cell and initiate intracellular signaling pathways. This leads to the activation of gene expression, resulting in the manifestation of androgen-dependent physiological processes and characteristics.

**Why Each Wrong Option is Incorrect:**

A. This option refers to the N-terminal end of androgen receptors, which is involved in the interaction with other proteins and transcription factors, rather than androgen binding.
B. This option addresses the role of estrogen receptors, which are responsible for estrogen-mediated effects in the body, rather than androgen receptors.
C. This option refers to the DNA-binding domain, which is involved in the interaction with DNA and regulating gene expression, rather than androgen binding.
D. This option discusses the role of the ligand-binding domain, which is responsible for binding to androgens and initiating intracellular signaling pathways, but not the C-terminal end.

**Clinical Pearl:** Understanding the function of the C-terminal end of androgen receptors is crucial for understanding the actions of androgens in male physiology, as well as recognizing potential issues related to androgen receptor dysfunction, such as in cases of hypogonadism or androgen receptor mutations.

**Correct Answer:** D. Ligand-Binding Domain