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: Surgery
Ulcerative colitis involves 
Select and explain. 
A. Serosa, B. Lamina propria, C. Mucosa, D. Circularis muscle
C: Mucosa
Answer: C: Mucosa 
Explanation: Answer 'c' i.e. Mucosa Ulcerative colitis involves mucosa and superficial submucosa with deeper layers unaffected except in fulminant disease.