**Core Concept**
The question is testing the effect of anesthetic agents on intracranial pressure (ICP). Intracranial pressure is the pressure within the cranial vault, which is the space within the skull. Anesthetic agents can affect ICP by altering cerebral blood flow, cerebral metabolism, or by direct effects on the brain.

**Why the Correct Answer is Right**
One of the anesthetic agents that causes a rise in intracranial pressure is ketamine. This is due to its ability to increase cerebral blood flow and cerebral metabolism, which in turn can lead to an increase in ICP. Ketamine also causes vasodilation of cerebral blood vessels, further contributing to increased ICP.

**Why Each Wrong Option is Incorrect**
**Option A:** Propofol is actually known to decrease ICP by reducing cerebral blood flow and cerebral metabolism.
**Option B:** Desflurane can cause cerebral vasodilation, but it is not typically associated with a significant increase in ICP.
**Option C:** Midazolam is a benzodiazepine that has a calming effect on the brain and does not typically increase ICP.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that ketamine can increase ICP, especially in patients with pre-existing intracranial hypertension. This is why ketamine is generally avoided in patients with traumatic brain injury or other conditions where increased ICP is a concern.

**Correct Answer:** C. Ketamine.