## **Core Concept**
The patient's presentation of syncope during defecation accompanied by gross bleeding suggests a condition that leads to acute blood loss and potentially a vasovagal response, causing the syncopal episode. The negative fecal occult blood test for cancer and no recent weight loss reduce the likelihood of a malignant process.

## **Why the Correct Answer is Right**
The likely colonoscopic finding in this scenario is **Diverticulosis** or more specifically, **Diverticular bleeding**. Diverticulosis is a condition where small, bulging pouches (diverticula) develop in the digestive tract, commonly in the colon. It is a common cause of significant lower gastrointestinal bleeding, especially in older adults. The bleeding is often sudden, painless, and may be massive enough to cause hemodynamic instability or, as in this case, a vasovagal response leading to syncope.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is blank and cannot be evaluated.
- **Option B:** This option is blank and cannot be evaluated.
- **Option C:** This option is blank and cannot be evaluated.
- **Option D:** This option is blank and cannot be evaluated.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that diverticular bleeding is a common cause of painless, large-volume hematochezia in elderly patients, and it can lead to hemodynamic instability. The fact that the fecal occult blood test for cancer was negative and there's no history of weight loss helps to steer the diagnosis away from colorectal cancer.

## **Correct Answer:** B. Diverticulosis.