**Core Concept**
The question requires knowledge of the pharmacological properties of inhalational anaesthetic agents, specifically their onset and recovery times. Inhalational anaesthetics are used for inducing and maintaining general anaesthesia, and their rapid onset and recovery times are crucial for day-case surgical procedures.

**Why the Correct Answer is Right**
Desflurane is an inhalational anaesthetic agent known for its rapid onset and recovery times. This is due to its low solubility in blood and tissues, which allows it to reach equilibrium quickly. Desflurane is a potent anaesthetic, but its low solubility also makes it a good choice for procedures where rapid recovery is desired. The agent can be turned off quickly, and the patient can be extubated soon after the end of surgery.

**Why Each Wrong Option is Incorrect**
**Option A:** Sevoflurane has a slower onset and recovery time compared to Desflurane, making it less desirable for day-case procedures.
**Option B:** Isoflurane has a slower onset and recovery time compared to Desflurane, and it can cause more respiratory depression.
**Option C:** Halothane has a slower onset and recovery time compared to Desflurane, and it can cause more cardiovascular depression.

**Clinical Pearl / High-Yield Fact**
When choosing an inhalational anaesthetic agent for day-case procedures, consider the agent's solubility in blood and tissues, as well as its potency and potential side effects.

**Correct Answer: C. Desflurane**