**Core Concept**
Adult intussusception is a rare condition where a part of the intestine telescopes into another, often leading to bowel obstruction and ischemia. It is usually caused by a lead point such as a tumor, polyp, or other mass, which acts as a focal point for the intussusception to occur.

**Why the Correct Answer is Right**
Adult intussusception is often associated with a lead point, which is a mass or lesion that initiates the intussusception process. This can be a tumor, polyp, or other abnormal growth within the intestine. The lead point can be located within the intestine or can be a distant organ or structure that is causing the intussusception through a process called "metachronous" intussusception.

**Why Each Wrong Option is Incorrect**
**Option A:** Adult intussusception is not typically caused by lymphoma. While lymphoma can cause intussusception in children, it is rare in adults.
**Option B:** Adult intussusception is not typically caused by Meckel's diverticulum. Meckel's diverticulum is a congenital anomaly that can cause intussusception in children, but it is rare in adults.
**Option C:** Adult intussusception is not typically caused by a benign lesion. While benign lesions such as polyps or lipomas can cause intussusception, malignant lesions are more common in adults.

**Clinical Pearl / High-Yield Fact**
The key to diagnosing adult intussusception is to consider it in the differential diagnosis of bowel obstruction or ischemia, especially in patients with a history of abdominal surgery or a known mass within the intestine.

**Correct Answer: C. Adult intussusception is not typically caused by a benign lesion.**