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
All are TRUE about the pathological changes in pseudomembranous enterocolitis, EXCEPT: 
Select and explain. 
A. 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
D: Rectal sparing is not a feature
Answer: D: Rectal sparing is not a feature 
Explanation: 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.