## **Core Concept**
The solubility of an anesthetic agent refers to its ability to dissolve in blood and tissues, which affects its onset and recovery times. Highly soluble agents have slower onset and recovery due to more time required to reach equilibrium, whereas less soluble agents have quicker onset and recovery.

## **Why the Correct Answer is Right**
Desflurane has a very low blood/gas partition coefficient, which indicates low solubility in blood and tissues. This property allows for rapid induction of anesthesia and quick recovery. Desflurane's low solubility enables it to quickly reach equilibrium between the alveoli and the blood, and then between the blood and the brain, facilitating fast onset of action.

## **Why Each Wrong Option is Incorrect**
* **Option A:** Sevoflurane has a higher blood/gas partition coefficient compared to desflurane, making it more soluble than desflurane. This results in a slightly slower onset and recovery compared to desflurane.
* **Option B:** Isoflurane also has a higher blood/gas partition coefficient than desflurane, indicating higher solubility and thus slower onset and recovery times compared to desflurane.
* **Option C:** Nitrous oxide has a very low blood/gas partition coefficient, similar to desflurane, but when comparing the options given and focusing on "anaesthetic agents" broadly, the context usually points towards volatile anaesthetics like desflurane.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the blood/gas partition coefficient is a critical determinant of how quickly an inhalational anesthetic agent can induce and recover from anesthesia. Agents with low blood/gas partition coefficients, like **desflurane**, are preferred in situations where rapid recovery is desired.

## **Correct Answer:** D. Desflurane