**Core Concept**
Sevoflurane, a volatile inhalational anesthetic, can increase intracranial pressure (ICP) due to its effect on cerebral vasodilation and increased cerebral blood volume, particularly in patients with pre-existing brain pathology or increased intracranial tension.

**Why the Correct Answer is Right**
Sevoflurane causes cerebral vasodilation and increased cerebral blood volume, which may elevate intracranial pressure (ICP) in susceptible individuals. This effect is mediated through its influence on cerebral blood flow and autoregulation, especially in patients with impaired cerebral autoregulation or brain injury. Unlike other agents, sevoflurane has a significant impact on cerebral metabolism and vascular tone, making it more likely to increase ICP compared to intravenous agents.

**Why Each Wrong Option is Incorrect**
Option A: Thiopentone does not significantly increase ICP and is known for its rapid onset and minimal cerebral vasodilation.
Option B: Propofol has a neutral or slightly depressant effect on cerebral blood flow and is associated with reduced ICP.
Option C: Lignocaine (lidocaine) is a local anesthetic with no significant central nervous system effects and does not influence intracranial pressure.

**Clinical Pearl / High-Yield Fact**
In patients with head injury or increased intracranial pressure, avoid agents that cause cerebral vasodilation—sevoflurane should be used cautiously, and propofol is often preferred for such cases.

✓ Correct Answer: D. Sevoflurane