**Core Concept**
Alkalinization of urine is a pharmacological intervention used to increase the pH of the urine, making it more favorable for the elimination of certain acidic substances, such as weak acids. This is particularly useful in cases of poisoning with acidic drugs, which can be more easily excreted in an alkaline environment.

**Why the Correct Answer is Right**
The mechanism of alkalinization involves the administration of a base, such as sodium bicarbonate, to increase the pH of the urine. This allows weakly acidic drugs to become more ionized, increasing their water solubility and facilitating their excretion. In the kidneys, the ionized form of these drugs is more likely to be excreted in the urine, rather than being reabsorbed back into the bloodstream. This is particularly effective for drugs such as phenobarbital, salicylates, and methotrexate.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the concept of alkalinization of urine.
**Option B:** This option may be related to a different treatment approach, such as dialysis or charcoal administration, but is not relevant to alkalinization of urine.
**Option C:** This option is incorrect because it is a different pharmacological intervention, such as acidification of urine, which is used to increase the elimination of certain basic substances.

**Clinical Pearl / High-Yield Fact**
It's essential to note that alkalinization of urine should be performed under close medical supervision, as excessive alkalinization can lead to complications such as metabolic alkalosis.

**Correct Answer: D.**