**Core Concept**
Antral Ca, or gastric cancer of the antrum, can lead to vomiting due to gastric outlet obstruction. This condition involves the mechanical blockage of the stomach's outlet, preventing normal gastric emptying. The antrum is the distal part of the stomach, adjacent to the pylorus.

**Why the Correct Answer is Right**
The correct answer involves the pathophysiology of gastric outlet obstruction. In this scenario, the repeated vomiting of a patient with Antral Ca is due to the mechanical obstruction caused by the tumor, which blocks the normal passage of food from the stomach into the small intestine. This obstruction leads to a buildup of food and stomach contents in the stomach, resulting in vomiting.

**Why Each Wrong Option is Incorrect**
**Option A:** - This option is not directly related to the pathophysiology of gastric outlet obstruction in Antral Ca.
**Option B:** - This option is not a common symptom or consequence of gastric outlet obstruction in Antral Ca.
**Option C:** - This option is not a characteristic finding in Antral Ca patients with gastric outlet obstruction.

**Clinical Pearl / High-Yield Fact**
Gastric outlet obstruction is a common complication of gastric cancer, particularly in the antral region. It is essential to recognize the symptoms of gastric outlet obstruction, such as vomiting, weight loss, and abdominal pain, to diagnose and manage Antral Ca promptly.

**Correct Answer:** C.