**Core Concept**
Adenosine is a naturally occurring purine nucleoside that plays a crucial role in various physiological processes, including energy transfer, signaling, and regulation of cardiac function. It is involved in the modulation of heart rate, contraction force, and vasodilation.

**Why the Correct Answer is Right**
Adenosine is used in the treatment of supraventricular tachycardia (SVT) due to its ability to slow heart rate and convert abnormal heart rhythms back to normal sinus rhythm. This is achieved through the activation of adenosine receptors, specifically A1 receptors, which are found on the sinoatrial (SA) node and atrioventricular (AV) node. Activation of these receptors leads to a decrease in heart rate and a reduction in the conduction velocity of electrical impulses through the AV node.

**Why Each Wrong Option is Incorrect**
**Option A:** Adenosine is not typically used in the treatment of hypertension. While adenosine does cause vasodilation, its primary use is not for blood pressure management.
**Option B:** Adenosine is not commonly used as a bronchodilator. Its primary effects are on the cardiovascular system, not the respiratory system.
**Option C:** Adenosine is not typically used in the treatment of seizures. While it may have some effects on neuronal excitability, it is not a primary treatment for seizure disorders.

**Clinical Pearl / High-Yield Fact**
Adenosine is unique in that it has a very short half-life, which allows for rapid reversal of its effects if necessary. This is due to its rapid metabolism by adenosine deaminase, an enzyme found in many tissues.

**Correct Answer:** C. Adenosine is used in the treatment of supraventricular tachycardia.