**Core Concept**
The urge for micturition is a complex physiological process regulated by the central nervous system, involving the coordination of the bladder, urethra, and spinal cord. The sensation of bladder fullness is mediated by stretch receptors in the bladder wall, which send signals to the spinal cord and ultimately to the brain.

**Why the Correct Answer is Right**
The correct answer is related to the concept of bladder distension and the role of stretch receptors. When the bladder is filled with urine, the bladder wall stretches, activating mechanoreceptors called stretch receptors. These receptors send signals to the spinal cord via the pelvic nerve, which then transmit the signal to the brain, resulting in the sensation of bladder fullness or the urge to urinate. This process is mediated by the release of neurotransmitters such as acetylcholine and substance P.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the sensation of bladder fullness is not solely due to the release of hormones such as oxytocin, which is involved in milk letdown and uterine contractions during childbirth.
* **Option B:** This option is incorrect because the sensation of bladder fullness is not solely due to the release of neurotransmitters such as dopamine, which is involved in reward and motor control.
* **Option C:** This option is incorrect because the sensation of bladder fullness is not solely due to the release of hormones such as vasopressin, which is involved in water reabsorption in the kidneys.

**Clinical Pearl / High-Yield Fact**
The sensation of bladder fullness is a complex process that involves the coordination of multiple neural pathways. It's essential to remember that the sensation of bladder fullness is not solely due to the release of a single neurotransmitter or hormone, but rather a complex interplay of neural signals.

**Correct Answer:** C.