**Core Concept**
The concept of gastric injury involves the understanding of the pathophysiology and clinical manifestations of various types of gastric damage, including stress ulceration, NSAID-induced ulcers, and Mallory-Weiss tears. Gastric injury can be caused by a combination of factors, including mucosal ischemia, acid-pepsin secretion, and mechanical stress.

**Why the Correct Answer is Right**
The correct answer will be related to a statement that is not true about gastric injury. Gastric injury can occur due to various factors, including stress, NSAID use, and mechanical stress. The mucosal lining of the stomach is protected by a layer of mucus and bicarbonate, which helps to neutralize acid and prevent damage. However, in cases of gastric injury, this protective layer can be compromised, leading to mucosal ischemia and damage.

**Why Each Wrong Option is Incorrect**
**Option A:** This option may be incorrect if it contradicts the established pathophysiology of gastric injury. For example, if it states that gastric injury is not caused by stress, which is a well-established risk factor.

**Option B:** This option may be incorrect if it contradicts the clinical manifestations of gastric injury. For example, if it states that gastric injury does not present with bleeding, which is a common complication of gastric injury.

**Option C:** This option may be incorrect if it contradicts the treatment options for gastric injury. For example, if it states that gastric injury is not treated with proton pump inhibitors, which are commonly used to reduce acid secretion and promote healing.

**Option D:** This option may be incorrect if it contradicts the anatomical location of gastric injury. For example, if it states that gastric injury occurs in the small intestine, which is not a typical location for gastric injury.

**Clinical Pearl / High-Yield Fact**
One important fact to remember is that gastric injury can occur in patients who are critically ill, particularly those who are mechanically ventilated or have coagulopathy. In these patients, stress ulcer prophylaxis with proton pump inhibitors or histamine-2 receptor antagonists is often recommended to reduce the risk of gastric injury.

**Correct Answer: D. Gastric injury occurs in the small intestine.**