**Core Concept**
Obstructive shock is a type of shock characterized by a reduction in cardiac output due to a mechanical obstruction in the cardiovascular system. This obstruction prevents the heart from pumping blood effectively, leading to a decrease in blood pressure and perfusion of vital organs.

**Why the Correct Answer is Right**
Obstructive shock can be caused by conditions such as cardiac tamponade, massive pulmonary embolism, or severe pulmonary hypertension, which impede blood flow through the heart or lungs. The obstruction can be due to external compression, fluid accumulation, or thromboembolic events. In these situations, the heart's ability to pump blood is compromised, leading to inadequate tissue perfusion and shock.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because distributive shock, typically caused by sepsis or anaphylaxis, is characterized by vasodilation and increased blood flow to peripheral tissues, rather than a mechanical obstruction.
**Option B:** This option is incorrect because cardiogenic shock, resulting from acute coronary syndrome or severe heart failure, is primarily caused by a failure of the heart to pump effectively, rather than an external mechanical obstruction.
**Option C:** This option is incorrect because hypovolemic shock, resulting from blood loss or fluid depletion, is characterized by a reduction in intravascular volume, rather than a mechanical obstruction.

**Clinical Pearl / High-Yield Fact**
In the context of shock, it's essential to differentiate between obstructive, distributive, cardiogenic, and hypovolemic shock based on the underlying cause and clinical presentation.

**Correct Answer:** C.