**Core Concept**
The most common complication after Fecal Retrograde Colonoscopy and Polyp (FRCP) is related to the procedure's technical difficulties and the underlying anatomy of the colon. This complication often involves damage to the surrounding tissues or the colon itself.

**Why the Correct Answer is Right**
The correct answer is related to the risk of colonic perforation, which can occur during the procedure, especially in areas with pre-existing disease or anatomical abnormalities. This can be due to the pressure exerted by the colonoscope or the use of air insufflation, leading to a tear in the colonic wall. The risk is higher in areas with diverticulosis, inflammatory bowel disease, or previous abdominal surgery.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might seem plausible, but it is not the most common complication. While bleeding can occur, it is typically managed conservatively.

**Option B:** This option is incorrect as it is not a recognized complication of FRCP.

**Option C:** This option is incorrect as it is not directly related to the procedure.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the risk of colonic perforation can be reduced by careful technique, gentle manipulation of the colonoscope, and careful use of air insufflation. Additionally, the use of a colonoscope with a smaller diameter and a flexible tip can also help minimize the risk of complications.

**Correct Answer:** C. Colonic perforation.