**Core Concept**
Inhalational anesthetics are used for neurosurgical procedures due to their ability to provide a rapid onset and offset of action, as well as a stable depth of anesthesia. The choice of inhalational agent for neurosurgery depends on its potency, blood-gas partition coefficient, and potential for neurotoxicity.

**Why the Correct Answer is Right**
Desflurane is the inhalational agent of choice for neurosurgery due to its low blood-gas partition coefficient, which allows for a rapid recovery and minimal residual effects. This is particularly beneficial in neurosurgical procedures where the patient needs to be quickly awakened and able to respond to commands. Additionally, desflurane has a low solubility in blood, which reduces the risk of accumulation and subsequent neurotoxicity.

**Why Each Wrong Option is Incorrect**
**Option A:** Isoflurane, while a commonly used inhalational agent, has a higher blood-gas partition coefficient compared to desflurane, which may result in a slower recovery and increased risk of residual effects.
**Option B:** Sevoflurane is often used in pediatric anesthesia due to its mild odor and non-irritating properties, but it has a higher blood-gas partition coefficient compared to desflurane, making it less ideal for neurosurgical procedures.
**Option C:** Halothane is an older inhalational agent with a higher risk of hepatotoxicity and potential for myocardial depression, making it less desirable for neurosurgical procedures.

**Clinical Pearl / High-Yield Fact**
When choosing an inhalational agent for neurosurgery, it's essential to consider the agent's blood-gas partition coefficient and potential for neurotoxicity. A low blood-gas partition coefficient, such as that of desflurane, can result in a rapid recovery and minimize residual effects, making it an ideal choice for neurosurgical procedures.

**Correct Answer: D. Desflurane**