This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Carcinoma of the Rt. colon commonly presents as - \nSelect and explain. \nA. Ulcerating lesion, B. Fungating, C. Stenosing, D. Infiltrating', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pathology of colon carcinoma\n\nColorectal carcinomas grow into different morphological patterns depending on the anatomic location\xa0of the tumor.\n\n\nRight colon\xa0→\xa0Grow as polypoid, exophytic (fungating) masses that extend along the wall of the cecum and ascending colon.\nLeft colon\xa0→\xa0Annular, encircling lesions that produce so-called napkin-ring constriction of the bowel.', 'role': 'assistant'}]