**Core Concept**
Minimal reabsorption from the kidney refers to the small amount of substances that are reabsorbed back into the bloodstream from the renal tubules. This process is crucial for maintaining electrolyte and fluid balance. The kidney's ability to reabsorb various substances varies, and understanding this concept is essential in clinical medicine.

**Why the Correct Answer is Right**
Urea is minimally reabsorbed due to the presence of high concentrations of urea in the renal tubules, which creates an osmotic gradient that prevents its reabsorption. In contrast, other substances like glucose, sodium, and bicarbonate are actively reabsorbed by the renal tubules. The high concentration of urea in the tubules also promotes its excretion, making it an ideal choice for minimal reabsorption.

**Why Each Wrong Option is Incorrect**
* **Option A:** Sodium reabsorption is an active process that occurs in the proximal convoluted tubule (PCT) and the thick ascending limb of the loop of Henle (TALH).
* **Option B:** Glucose reabsorption occurs primarily in the PCT via facilitated diffusion using sodium-glucose cotransporters (SGLTs).
* **Option C:** Bicarbonate reabsorption is an active process that occurs in the PCT, where it is converted from carbon dioxide and water, and also in the TALH.

**Clinical Pearl / High-Yield Fact**
The kidneys reabsorb approximately 65-70% of filtered sodium, 90% of filtered glucose, and 80% of filtered bicarbonate. In contrast, urea is minimally reabsorbed, making it an ideal marker for assessing renal function.

**✓ Correct Answer: D. Urea**