**Core Concept**
Pain sensation can be modulated by various factors, including repetitive stimulation, which can lead to a phenomenon known as **sensitization**. This process involves an increase in the excitability of nociceptive neurons, making them more responsive to painful stimuli. The underlying mechanism involves changes in the expression and function of various ion channels and receptors, particularly in the central nervous system.

**Why the Correct Answer is Right**
Repetitive stimulation can lead to sensitization through several mechanisms. One key process is the **activation of NMDA receptors**, which are glutamate-gated ion channels that play a crucial role in synaptic plasticity and nociception. When activated, NMDA receptors allow an influx of calcium ions, which can lead to the activation of various downstream signaling pathways, including the **phosphorylation of NMDA receptors themselves**, making them more responsive to glutamate. This can result in an increase in pain perception. Additionally, repetitive stimulation can also lead to the **release of pro-inflammatory mediators**, such as bradykinin and prostaglandins, which can further enhance pain sensation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the phenomenon of sensitization and repetitive stimulation.
**Option B:** This option is incorrect because it does not address the underlying mechanism of sensitization.
**Option C:** This option is incorrect because it refers to a different phenomenon altogether.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that sensitization can occur through various mechanisms, including repetitive stimulation, inflammation, and stress. This can lead to an increase in pain perception, making it more challenging to manage chronic pain conditions.

**Correct Answer: C.**