**Core Concept**
The concept of drug affinity and its clinical application is crucial in pharmacology. High-affinity drugs bind strongly to their target receptors, allowing for lower doses and minimizing side effects.

**Why the Correct Answer is Right**
Drugs with high affinity for their target receptors can effectively bind to a smaller percentage of available receptors, leading to a stronger pharmacological effect at lower doses. This is particularly useful in conditions where the target receptor density is low or in cases where the drug needs to be administered cautiously to avoid side effects. The high-affinity binding of these drugs also leads to a faster onset of action and a more sustained effect.

**Why Each Wrong Option is Incorrect**
* **Option A:** Incorrect because low-affinity drugs have a weaker binding capacity and require higher doses to achieve the desired effect, which may lead to increased side effects.
* **Option B:** Incorrect because drugs with high potency can achieve the desired effect at lower doses, but their efficacy may be limited by their pharmacokinetic properties.
* **Option C:** Incorrect because drugs with high volume of distribution may require higher doses to achieve therapeutic concentrations, which may not be suitable for all patients.

**Clinical Pearl / High-Yield Fact**
High-affinity drugs are particularly useful in conditions such as Parkinson's disease, where the target receptor density is low, and a small increase in dopamine levels can significantly improve symptoms.

**Correct Answer: B. Drugs with high potency.**