**Core Concept**
The sublingual route of drug administration involves placing a medication under the tongue, where it is absorbed into the bloodstream through the sublingual tissues. This route is often used for medications that require rapid onset of action, such as nitroglycerin for angina.

**Why the Correct Answer is Right**
The correct answer is determined by identifying which of the listed medications is not typically administered sublingually. Nitroglycerin and isosorbide dinitrate are both commonly used for angina and are administered sublingually to provide rapid relief. However, the other options do not typically follow this route of administration.

**Why Each Wrong Option is Incorrect**
**Option A:** Nitroglycerin is often administered sublingually, making it the correct answer.
**Option B:** Isosorbide dinitrate is also commonly administered sublingually for angina, so it's not the correct answer.
**Option C:** Nitroprusside is typically administered intravenously for acute hypertension, not sublingually.

**Clinical Pearl / High-Yield Fact**
When administering medications sublingually, it's essential to ensure the patient is in a comfortable position to allow for proper absorption, and to instruct them not to swallow the medication until it has been fully absorbed.

**Correct Answer:** C. Nitroprusside.