**Core Concept**
Ketamine is an intravenous anesthetic agent known for its unique cardiovascular effects, which can be attributed to its sympathomimetic properties, similar to those of cocaine. This is due to its ability to block NMDA receptors in the central nervous system, leading to increased sympathetic tone and subsequent effects on the cardiovascular system.

**Why the Correct Answer is Right**
Ketamine's sympathomimetic effects are primarily mediated through the release of norepinephrine from the sympathetic nervous system. This results in increased heart rate, blood pressure, and cardiac output. The mechanism is similar to that of cocaine, which blocks the reuptake of norepinephrine, leading to an accumulation of the neurotransmitter in the synaptic cleft and subsequent sympathomimetic effects.

**Why Each Wrong Option is Incorrect**
**Option A:** Propofol is a commonly used intravenous anesthetic agent that has a depressant effect on the cardiovascular system, rather than a sympathomimetic effect. It can cause hypotension and decreased cardiac output.

**Option B:** Thiopental is another intravenous anesthetic agent that can cause a decrease in blood pressure due to its vasodilatory effects. It does not have a sympathomimetic effect similar to cocaine.

**Option C:** Etomidate is a short-acting intravenous anesthetic agent that is known for its minimal impact on the cardiovascular system. It can cause some degree of vasodilation, but it does not have a sympathomimetic effect similar to cocaine.

**Clinical Pearl / High-Yield Fact**
Ketamine's sympathomimetic effects can be beneficial in patients with hypotension or vasodilation, as it can help to increase blood pressure and cardiac output. However, it can also lead to increased intracranial pressure and myocardial ischemia in susceptible patients.

**Correct Answer:** C. Etomidate is not correct, I must fill in the correct answer. The correct answer is **Ketamine**.