**Core Concept:** Pain is an essential protective mechanism that alerts the individual to potential tissue harm. Tactile stimulation of the skin can inhibit pain signals by activating specific types of afferent neurons. Afferent neurons are sensory neurons that transmit information from sensory receptors to the central nervous system. Mechanoreceptors are specialized sensory receptors that respond to mechanical stimuli, such as touch or movement.

**Why the Correct Answer is Right:** The correct answer is C. Mechanoreceptors, also known as pressure receptors or touch receptors, are specialized sensory receptors in the skin that respond to mechanical stimuli, including touch and pressure. When a person applies pressure to the damaged area, they activate these mechanoreceptors, which in turn inhibit pain signals by activating Aδ and C pain fibers. This process is known as gate control theory, which proposes that large myelinated Aδ fibers and unmyelinated C fibers can be "gated" or inhibited by activating other sensory fibers, thus reducing pain transmission to the central nervous system.

**Why Each Wrong Option is Incorrect:**

A. This option is incorrect because it refers to thermoreceptors, which respond to temperature changes and are not involved in pain inhibition by tactile stimulation.
B. This option is incorrect because it refers to chemoreceptors, which respond to chemical stimuli and are not relevant to pain inhibition by tactile stimulation.
D. This option is incorrect because it refers to proprioceptors, which respond to joint movement and muscle tension, and are not involved in pain inhibition by tactile stimulation.

**Clinical Pearl:** The tactile stimulation of the skin through pressure can provide immediate pain relief in cases of minor injuries, such as cutting one's finger, as seen in the question. This is due to the activation of mechanoreceptors, which inhibit pain signals through the gate control theory. This understanding can guide patients and healthcare professionals to utilize this natural mechanism for pain relief in minor injuries, reducing dependence on unnecessary pharmacological interventions.