**Question:** Ameboid ulcer is a feature of

A. Gastric ulcer
B. Duodenal ulcer
C. Colonic ulcer
D. Cutaneous ulcer

**Correct Answer:** C. Colonic ulcer

**Core Concept:** Ameboid ulcer refers to a type of ulcer that develops in the gastrointestinal tract, specifically in the colon. Amebiasis is an infection caused by the protozoan parasite Entamoeba histolytica. In some cases, this infection can lead to complications, including amebic ulcers.

**Why the Correct Answer is Right:** Colonic ulcers are a result of amebic infection, as mentioned above. E. histolytica can invade the intestinal mucosa, causing damage and ulceration. Amebic ulcers are typically located in the left colon and rectum, which is why option C (colonic ulcer) is the correct answer.

**Why Each Wrong Option is Incorrect:**

A. Gastric ulcer: Gastric ulcers are primarily caused by bacteria like H. pylori and are located in the stomach. This option is incorrect because amebic ulcers are not found in the stomach.

B. Duodenal ulcer: Duodenal ulcers are caused by H. pylori or NSAIDs and are located in the duodenum, not related to amebiasis.

D. Cutaneous ulcer: Cutaneous ulcers are lesions that affect the skin, not related to amebiasis or amebic ulcers.

**Clinical Pearl:** Amebic ulcers are a rare but potentially severe complication of amebiasis, particularly in endemic areas where the infection is prevalent. Prompt diagnosis and treatment are essential to prevent complications and ensure optimal patient outcomes.