**Core Concept**
The detection of clinically significant ascites is crucial for diagnosing and managing various liver and abdominal disorders. The minimal amount of fluid required to produce clinically detectable ascites is an important clinical threshold.

**Why the Correct Answer is Right**
The correct answer is 300 cc because clinically significant ascites can be detected when the amount of fluid exceeds 300-400 cc. This is due to the accumulation of fluid in the peritoneal cavity, which causes the abdomen to become distended and taut. The peritoneum becomes increasingly tense as the fluid volume increases, eventually leading to a noticeable bulge in the abdominal wall. The fluid accumulation also causes the liver and spleen to become shifted downward, further contributing to the clinical detection of ascites.

**Why Each Wrong Option is Incorrect**
**Option B:** 600 cc is an excessive amount of fluid, and ascites is often clinically detectable at lower volumes. A volume of 600 cc would likely result in a more pronounced abdominal distension and potentially even respiratory compromise.

**Option C:** 1 litre is a significantly higher volume than the minimal amount required for clinically detectable ascites. At this volume, the abdominal distension would be more pronounced, and the patient may experience respiratory distress due to the increased intra-abdominal pressure.

**Option D:** 2 litre is an extremely high volume of fluid, far exceeding the minimal amount required for clinically detectable ascites. At this volume, the patient would likely experience severe respiratory compromise due to the increased intra-abdominal pressure.

**Clinical Pearl / High-Yield Fact**
It is essential to note that clinically detectable ascites can be present even in the absence of significant abdominal distension. A palpable fluid wave or shifting dullness on percussion can be indicative of ascites, even if the amount of fluid is relatively small.

**Correct Answer Line**
✓ Correct Answer: A. 300 cc