**Core Concept**
Retained Antrum Syndrome (RAS) is a rare complication of gastric surgery, characterized by the presence of a residual gastric antrum, which can lead to various symptoms and complications. The retained antrum can cause gastric outlet obstruction, peptic ulcers, and other gastrointestinal issues.

**Why the Correct Answer is Right**
The correct answer, **Option C: Positive Secretin Stimulation Test**, is incorrect because a positive test would indicate a functioning antrum, which is not the case in Retained Antrum Syndrome. The secretin stimulation test is used to assess the function of the antral glands, and a positive result would suggest that the antrum is still producing gastrin, which is not expected in RAS.

**Why Each Wrong Option is Incorrect**
**Option A:** A technetium 99 m scan is indeed used for diagnosing various gastrointestinal conditions, including gastric outlet obstruction, which can be a complication of RAS. This option is not necessarily incorrect.
**Option B:** Retained Antrum Syndrome is often seen after Billroth II surgery, which involves a gastrojejunostomy. This type of surgery can lead to the retention of the antrum, making this statement true.
**Option D:** The calcium provocation test is used to assess the function of the parietal cells in the stomach, and a negative result would indicate that the retained antrum is not producing gastric acid, which is consistent with RAS.

**Clinical Pearl / High-Yield Fact**
A key feature of Retained Antrum Syndrome is the presence of gastric outlet obstruction, which can be diagnosed using a barium swallow or upper endoscopy. It's essential to recognize this condition, as it requires surgical intervention to correct the retained antrum.

**✓ Correct Answer: C. Positive Secretin Stimulation Test**