**Core Concept**
Ketamine is a non-competitive NMDA receptor antagonist used for anesthesia and sedation. Its pharmacokinetics and pharmacodynamics are critical in determining the optimal dose for clinical use.

**Why the Correct Answer is Right**
The correct dose of ketamine is 1-2 mg/kg IV, typically administered as a bolus over 30 seconds to 1 minute. This dose range is sufficient to induce sedation and anesthesia while minimizing the risk of adverse effects, such as hallucinations and increased intracranial pressure. The onset of action is rapid, and the duration of effect is typically 15-30 minutes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the dose of ketamine is not typically started at 0.5 mg/kg, as this may not be sufficient to achieve adequate levels of sedation or anesthesia.
**Option B:** This option is incorrect because the dose of ketamine is not typically administered as a continuous infusion of 0.5-1 mg/kg/hour, as this may lead to prolonged sedation and increased risk of adverse effects.
**Option C:** This option is incorrect because the dose of ketamine is not typically administered at 5-10 mg/kg, as this is excessive and may lead to severe respiratory and cardiovascular depression.

**Clinical Pearl / High-Yield Fact**
When administering ketamine, it is essential to monitor the patient's vital signs and level of sedation closely, as the dose can easily be escalated to toxic levels. A common mnemonic to remember the key properties of ketamine is "KET": "K" for ketamine, "E" for emergence, "T" for tolerance, and "S" for sedation.

**Correct Answer: C. 5-10 mg/kg**