**Core Concept**
The question is testing knowledge on the complications and outcomes associated with peptic ulcers, specifically the most common cause of death in patients with this condition. The underlying principle is the pathophysiology of peptic ulcers and their potential complications.

**Why the Correct Answer is Right**
The commonest cause of death in peptic ulcer patients is hemorrhage. This is due to the risk of bleeding from the ulcer, which can be life-threatening if not promptly treated. The bleeding is often due to erosion of the ulcer into a major blood vessel, such as the gastroduodenal artery or the left gastric artery.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not specified, so we cannot evaluate its correctness.
* **Option B:** While perforation is a serious complication of peptic ulcers, it is not the most common cause of death in these patients.
* **Option C:** This option is also not specified, so we cannot evaluate its correctness.

**Clinical Pearl / High-Yield Fact**
It is essential for clinicians to recognize the signs and symptoms of bleeding in peptic ulcer patients, such as melena, hematemesis, and syncope, and to initiate prompt treatment to prevent mortality.

**Correct Answer:** B. Perforation is a serious complication of peptic ulcers but not the most common cause of death.