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': 'All are TRUE about the pathological changes in pseudomembranous enterocolitis, EXCEPT: \nSelect and explain. \nA. It is confined to the colonic mucosa, B. The whole colon is involved, C. The epithelium is eroded and necrotic in ceain areas, D. Rectal sparing is not a feature', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PATHOLOGICAL CHANGES IN PSEUDOMEMBRANOUS ENTEROCOLITIS:It is confined to the colonic mucosaIt appear as 1- to 2-mm whitish-yellow plaques initiallyThe whole colon is usually involved10% of patients have rectal sparingThe epithelium is eroded and necrotic in focal areas, with neutrophil infiltration of the mucosa Ref: Harrison, Edition-18, page-1092.', 'role': 'assistant'}]