**Core Concept**
Septic shock is a severe, life-threatening medical condition that occurs when there is a significant drop in blood pressure due to an overwhelming infection. It is characterized by the presence of a systemic inflammatory response syndrome (SIRS) and organ dysfunction. The pathophysiology of septic shock involves the release of pro-inflammatory cytokines, which lead to vasodilation, decreased vascular tone, and ultimately, hypotension.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of septic shock. During septic shock, there is a massive release of pro-inflammatory cytokines, such as tumor necrosis factor-alpha (TNF-alpha) and interleukin-1 beta (IL-1β), which activate various cellular pathways, leading to the production of nitric oxide (NO). NO causes vasodilation, leading to a significant drop in blood pressure. Additionally, the release of pro-inflammatory cytokines also leads to the activation of the hypothalamic-pituitary-adrenal (HPA) axis, resulting in the release of cortisol, which helps to increase blood pressure by promoting vasoconstriction.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not accurately describe a feature of septic shock. While myocardial depression is a feature of septic shock, it is not the most characteristic or specific feature.
* **Option B:** This option is incorrect as it does not accurately describe a feature of septic shock. While peripheral vasodilation is a feature of septic shock, it is not the most characteristic or specific feature.
* **Option C:** This option is incorrect as it does not accurately describe a feature of septic shock. While adrenal insufficiency can occur in septic shock, it is not a characteristic feature of the condition.

**Clinical Pearl / High-Yield Fact**
One of the most important features of septic shock is the presence of a significant drop in blood pressure, which can be due to a variety of factors, including vasodilation, decreased vascular tone, and myocardial depression. Early recognition and treatment of septic shock are critical to prevent further organ dysfunction and improve patient outcomes.

**Correct Answer: B. Peripheral vasodilation**