**Core Concept**
Feedforward mechanisms are pre-emptive physiological responses that occur before the actual stimulus reaches the receptor. This type of mechanism helps to prevent the occurrence of certain physiological events by initiating a response that counteracts the impending stimulus.

**Why the Correct Answer is Right**
The correct answer is an example of feedforward mechanism because it involves the activation of a response system before the actual stimulus reaches the sensory receptors. This is achieved through the release of neurotransmitters or hormones that trigger a response that counteracts the impending stimulus. For instance, the baroreceptor reflex involves the activation of the baroreceptor before the increase in blood pressure, which then triggers a response to decrease the blood pressure.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is an example of a negative feedback mechanism, which occurs after the actual stimulus has reached the receptor and is trying to restore homeostasis.
* **Option B:** This is an example of a reflex arc, which involves the activation of a response system after the actual stimulus has reached the sensory receptors.
* **Option C:** This is an example of a compensatory mechanism, which occurs after the actual stimulus has reached the receptor and is trying to restore homeostasis.

**Clinical Pearl / High-Yield Fact**
It is essential to understand the different types of physiological mechanisms, including feedforward, negative feedback, and reflex arcs, to appreciate how the body maintains homeostasis in various physiological states.

**Correct Answer: C. This is an example of a compensatory mechanism, which occurs after the actual stimulus has reached the receptor and is trying to restore homeostasis.**