**Core Concept**
Metabolism is the process by which the body converts lipophilic (lipid-soluble) drugs into more water-soluble metabolites that can be easily excreted. This process is crucial for eliminating drugs from the body and preventing their accumulation.

**Why the Correct Answer is Right**
The primary goal of metabolism is to convert lipid-soluble drugs into water-soluble metabolites. This is achieved through various enzymatic reactions, including oxidation, reduction, and hydrolysis. The liver is the primary site of drug metabolism, where enzymes such as cytochrome P450 play a crucial role in converting lipophilic drugs into more polar metabolites. This process increases the drug's water solubility, allowing it to be excreted through the kidneys or other routes.

**Why Each Wrong Option is Incorrect**
**Option A:** Activation of the active drug is not the primary goal of metabolism. While some drugs may undergo activation through metabolic processes, this is not the primary purpose of metabolism.

**Option B:** Conversion of prodrug to active metabolite is a specific type of metabolic reaction, but it is not the primary result of drug metabolism. Prodrugs are designed to be converted into active metabolites through metabolic processes, but this is a distinct phenomenon from the general process of metabolism.

**Option D:** Conversion of water-soluble drugs to lipid-soluble metabolites is the opposite of the primary goal of metabolism. Water-soluble drugs are typically more easily excreted from the body, and metabolism is not primarily aimed at converting them into lipid-soluble metabolites.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the primary goal of drug metabolism is to increase a drug's water solubility, allowing for its efficient elimination from the body. This is achieved through various enzymatic reactions, primarily in the liver.

**✓ Correct Answer: C. Conversion of lipid soluble drugs to water soluble metabolites**