**Core Concept**
Blood pressure is a hemodynamic parameter that represents the force exerted by blood against the walls of blood vessels. It is a crucial indicator of cardiovascular health and is measured in units that reflect the pressure gradient between the heart and the peripheral circulation.

**Why the Correct Answer is Right**
The correct unit for measuring blood pressure is millimeters of mercury (mmHg). This unit is derived from the height of a column of mercury that would exert the same pressure as the blood pressure being measured. In other words, 1 mmHg is equivalent to the pressure exerted by a column of mercury 1 mm high. The use of mmHg as the standard unit for blood pressure measurement is based on the fact that it accurately reflects the pressure gradient between the heart and the peripheral circulation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because milliliters per minute (mL/min) is a unit of blood flow, not blood pressure.
**Option B:** This option is incorrect because grams per square centimeter (g/cm²) is a unit of pressure, but it is not specific to blood pressure and is not commonly used in clinical practice.
**Option C:** This option is incorrect because pascals (Pa) is a unit of pressure, but it is not commonly used to measure blood pressure in clinical practice.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that blood pressure is a dynamic parameter that can vary depending on the location of measurement (e.g., systolic pressure is typically higher in the aorta than in the peripheral circulation).

**Correct Answer: C. millimeters of mercury (mmHg)**