**Core Concept**
The pylorus-preserving pancreaticoduodenectomy (PPPD) is a modified surgical procedure for treating pancreatic cancer and other conditions affecting the pancreas and duodenum. This operation aims to preserve the pylorus and a portion of the duodenum to minimize gastrointestinal complications.

**Why the Correct Answer is Right**
During a pylorus-preserving pancreaticoduodenectomy, the primary goal is to remove the tumor while preserving the pylorus and a significant portion of the duodenum. The key structures resected in this procedure include the head of the pancreas, the duodenum, the distal common bile duct, and the gallbladder. The pylorus is preserved to maintain gastric emptying and reduce the risk of gastric stasis. The preserved pylorus and duodenum enable the patient to maintain normal digestive function post-operatively.

**Why Each Wrong Option is Incorrect**
**Option A:** This option does not provide a clear answer choice, making it impossible to assess its correctness.
**Option B:** This option is not a correct answer choice, as the pylorus is indeed preserved in this procedure.
**Option C:** This option does not accurately describe the structures resected during a pylorus-preserving pancreaticoduodenectomy.

**Clinical Pearl / High-Yield Fact**
In a pylorus-preserving pancreaticoduodenectomy, the preserved pylorus and duodenum can lead to a reduced risk of gastric stasis and other gastrointestinal complications compared to traditional Whipple procedures. However, patients may still experience long-term issues with pancreatic enzyme supplementation and potential bile duct strictures.

**Correct Answer: B. The pylorus.**