**Core Concept**
Le Facies sympathique, also known as the sympathetic face, is a characteristic facial expression associated with sympathetic nervous system activation. This facial expression is typically marked by a tense, anxious, or apprehensive appearance.

**Why the Correct Answer is Right**
The sympathetic nervous system is responsible for the "fight or flight" response, which prepares the body to respond to stress or danger. Activation of the sympathetic nervous system leads to increased heart rate, blood pressure, and respiration, as well as pupillary dilation and a characteristic facial expression. The facial expression associated with sympathetic nervous system activation is characterized by a tense brow, narrowed eyes, and a pursed mouth. This expression is often seen in individuals who are under stress or experiencing anxiety.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not a recognized term associated with sympathetic nervous system activation or a characteristic facial expression.
**Option B:** Incorrect because it is not a specific facial expression or characteristic associated with sympathetic nervous system activation.
**Option C:** Incorrect because it is not a recognized term or characteristic associated with sympathetic nervous system activation.

**Clinical Pearl / High-Yield Fact**
The "fight or flight" response is a classic example of the body's sympathetic nervous system activation, and the associated facial expression is a key clinical clue to identify individuals who are experiencing stress or anxiety.

**Correct Answer: C.**