**Core Concept**
Cardiac tamponade is a life-threatening condition characterized by the accumulation of fluid in the pericardial sac, leading to compression of the heart and impeding cardiac filling. The goal of treatment is to relieve the compression and restore cardiac function.

**Why the Correct Answer is Right**
The treatment of choice for cardiac tamponade is pericardiocentesis, which involves the insertion of a needle or catheter into the pericardial sac to drain the accumulated fluid. This procedure is often performed under echocardiographic guidance to ensure accurate placement and minimize complications. The relief of compression allows for restoration of cardiac filling and improved cardiac output. In cases of traumatic tamponade, pericardiocentesis is often performed concurrently with thoracocentesis to remove blood from the pleural space.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not address the underlying cause of cardiac tamponade. While medications like morphine may help manage symptoms, they do not provide a definitive solution.
* **Option B:** This option is incorrect because it is not a primary treatment for cardiac tamponade. While patients with cardiac tamponade may require fluid resuscitation, this is not the primary treatment for the condition.
* **Option C:** This option is incorrect because it is not a specific treatment for cardiac tamponade. While surgical intervention may be necessary in some cases, it is not the first line of treatment.

**Clinical Pearl / High-Yield Fact**
In cases of cardiac tamponade, a significant increase in jugular venous distension (JVD) and a decrease in systolic blood pressure are characteristic findings. A rapid response to pericardiocentesis, with resolution of JVD and improvement in blood pressure, is a key clinical indicator of effective treatment.

**Correct Answer:** C.