This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': 'Apple core apppearence in barium enema is seen in - \nSelect and explain. \nA. Colonic carcinoma, B. Fissure in ano, C. Rectal carcinoma, D. Hemorrhoides', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Colonic carcinoma Some Imp. Radiological featuresSeen in* Spider leg appearance* Polycystic kidney* Cobra head appearance* Ureterocele* Flower vase appearance of ureters* Horse shoe kidney* Sandy patches* Schistosomiasis of bladder* Soap bubble appearance* Hydronephrosis* Apple core lesion on barium enema* Ca colon* Claw appearance on barium enema* Intussusception* Saw tooth appearance* Diverticula of colon* Birds beak appearance of esophagus on barium meal* Achalasia* Cork screw appearance of esophagus on barium meal* Diffuse esophageal spasm* String sign of Kantor* Crohn's ds* Thumb printing sign* Ischemic colitis", 'role': 'assistant'}]