**Core Concept**
Dilatant liquids exhibit a unique rheological behavior where their viscosity increases with increasing shear rate. This occurs due to the breakdown of the complex network of particles or fibers that make up the liquid, leading to a more fluid-like behavior at low shear rates and a more solid-like behavior at high shear rates.

**Why the Correct Answer is Right**
The correct answer is a dilatant fluid, which is characterized by an increase in viscosity with increasing shear rate. This is often observed in suspensions of particles or fibers, such as cornstarch in water or blood. When subjected to low shear rates, these liquids exhibit a high degree of resistance to flow, but as the shear rate increases, the particles or fibers begin to break down and the liquid becomes more fluid-like.

**Why Each Wrong Option is Incorrect**
**Option B:** A pseudoplastic liquid exhibits a decrease in viscosity with increasing shear rate, which is the opposite of the dilatant behavior.

**Option C:** A Newtonian liquid exhibits a constant viscosity regardless of the shear rate, which does not accurately describe the rheological behavior of dilatant liquids.

**Clinical Pearl / High-Yield Fact**
Dilatant liquids are often encountered in medical devices and equipment, such as blood flow meters and infusion pumps, where accurate measurement of viscosity is critical to ensure proper function.

**Correct Answer: D. Dilatant fluid.**