**Core Concept**
Dieulafoy's lesion is a rare cause of gastrointestinal bleeding, characterized by a small, abnormally dilated artery that penetrates the mucosa and submucosa without the usual protective muscular layer. This anomaly can lead to ulceration and bleeding.

**Why the Correct Answer is Right**
The preferred treatment for Dieulafoy's lesion is actually endoscopic treatment, specifically thermal coagulation or band ligation, rather than angiographic embolization. This is because endoscopic treatment allows for direct visualization and targeted therapy, reducing the risk of complications and recurrence.

**Why Each Wrong Option is Incorrect**
**Option A:** Angiographic embolization is not the preferred treatment for Dieulafoy's lesion, as it may not address the underlying cause and can lead to complications such as bowel ischemia.
**Option B:** Endoscopic treatment can indeed be given for Dieulafoy's lesion, making this option incorrect.
**Option C:** The pulsation of the artery does not directly cause ulceration; rather, the abnormally dilated artery is more susceptible to erosion and bleeding.
**Option D:** Dieulafoy's lesion is characterized by a submucosal artery, making this statement correct, but not relevant to the question.

**Clinical Pearl / High-Yield Fact**
Dieulafoy's lesion is often found in the stomach, but can also occur in the small intestine or colon. It is essential to recognize this condition and treat it promptly to prevent complications and recurrence.

**✓ Correct Answer:** A. Angiographic embolization is the preferred treatment