**Core Concept**
Celiac plexus block is a regional anesthesia technique used to manage chronic abdominal pain, particularly from pancreatic or gastric malignancies. It involves injecting local anesthetics or steroids around the celiac plexus, a complex network of nerves supplying the abdominal organs.

**Why the Correct Answer is Right**
The celiac plexus block can be performed through various approaches, including the classic retrocrural approach, but also the anterior and posterior approaches. These approaches allow for selective blockade of the celiac plexus and can be tailored to individual patient anatomy and pain distribution. The block can provide effective pain relief for patients with abdominal malignancies, such as gastric cancer, by interrupting the nociceptive signals transmitted through the celiac plexus.

**Why Each Wrong Option is Incorrect**
**Option A:** Relieved pain from gastric malignancy - This is true, as the celiac plexus block can provide effective pain relief for patients with abdominal malignancies, including gastric cancer.

**Option B:** Cause hypotention - This is true, as the celiac plexus block can cause vasodilation and hypotension due to the disruption of sympathetic tone to the abdominal organs.

**Option C:** Can be used to provide anesthesia for intra-abdominal surgery - This is true, as the celiac plexus block can be used to provide regional anesthesia for intra-abdominal surgery, reducing the need for general anesthesia.

**Option D:** Can be given only by retrocrural (classic) approach - This is the incorrect statement, as the celiac plexus block can be performed through various approaches, including the anterior and posterior approaches, in addition to the classic retrocrural approach.

**Clinical Pearl / High-Yield Fact**
The celiac plexus block is a useful technique for managing chronic abdominal pain, but it should be used judiciously, as it can cause hypotension and other systemic effects. The choice of approach depends on individual patient anatomy and pain distribution, and the block should be performed by experienced practitioners to minimize complications.

**✓ Correct Answer: D. Can be given only by retrocrural (classic) approach**