**Core Concept**
In acute pancreatitis, the destruction of fat is primarily due to the action of pancreatic enzymes, which are normally involved in fat digestion. These enzymes are activated within the pancreas and then released into the bloodstream, where they can cause damage to surrounding tissues.

**Why the Correct Answer is Right**
The correct answer involves lipase and trypsin, two key enzymes responsible for fat destruction in acute pancreatitis. Lipase breaks down triglycerides into fatty acids and glycerol, while trypsin activates other pancreatic enzymes, including lipase. This activation cascade leads to the excessive breakdown of fat, resulting in the characteristic fat necrosis seen in acute pancreatitis. The activation of trypsin is particularly important, as it can also activate other enzymes, such as elastase, which contribute to tissue damage.

**Why Each Wrong Option is Incorrect**
**Option B:** Secretion is a process by which the pancreas releases digestive enzymes and bicarbonate into the duodenum. While secretion is essential for normal digestion, it is not directly responsible for fat destruction in acute pancreatitis.

**Option C:** Elastase is a pancreatic enzyme that breaks down elastin, a protein found in connective tissue. While elastase can contribute to tissue damage in acute pancreatitis, it is not the primary enzyme responsible for fat destruction.

**Option D:** Cholecystokinin (CCK) is a hormone released by the duodenum in response to fat and protein ingestion. CCK stimulates the pancreas to release digestive enzymes, but it is not directly involved in fat destruction in acute pancreatitis.

**Clinical Pearl / High-Yield Fact**
In acute pancreatitis, the activation of pancreatic enzymes can lead to a cascade of tissue damage, including fat necrosis, inflammation, and potentially life-threatening complications. The timely administration of pancreatic enzyme inhibitors, such as protease inhibitors, can help mitigate this damage.

**✓ Correct Answer: A. Lipase and trypsin**