**Core Concept**
Septic shock is a severe and potentially life-threatening medical condition characterized by a systemic inflammatory response to an infection, leading to organ dysfunction and failure. It is a complex pathophysiological process involving the interplay of multiple inflammatory mediators, endothelial dysfunction, and impaired coagulation.

**Why the Correct Answer is Right**
The correct answer relates to the pathophysiological hallmark of septic shock, which is the **disruption of the normal balance between vasodilation and vasoconstriction**. This disruption leads to **hypotension**, despite an **increased cardiac output**. The underlying mechanism involves the release of pro-inflammatory cytokines, such as TNF-alpha and IL-1 beta, which induce the production of nitric oxide (NO) in the endothelium. NO causes smooth muscle relaxation, leading to vasodilation and a subsequent decrease in blood pressure.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the pathophysiological hallmark of septic shock. While septic shock does involve a systemic inflammatory response, the hallmark is not the release of inflammatory mediators alone.
**Option B:** This option is incorrect because it is a feature of sepsis, but not septic shock. Sepsis is characterized by an acute inflammatory response to an infection, whereas septic shock involves organ dysfunction and failure.
**Option C:** This option is incorrect because it is a feature of cardiogenic shock, not septic shock. Cardiogenic shock involves a failure of the heart to pump blood effectively, whereas septic shock involves a systemic inflammatory response and vasodilation.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that septic shock is a clinical diagnosis, and the diagnosis should be made based on a combination of clinical findings, laboratory results, and imaging studies. The **sepsis-3 definition** emphasizes the importance of a **sequential organ failure assessment (SOFA) score** to diagnose septic shock.

**Correct Answer: C. Hypotension despite an increased cardiac output.**