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: Pediatrics
All of the following are true about Crohn's disease except. 
Select and explain. 
A. Cobble stone appearance, B. Skip lesions seen, C. Perianal fistula is seen, D. It is superficial inflammation involving mucosa
D: It is superficial inflammation involving mucosa
Answer: D: It is superficial inflammation involving mucosa 
Explanation: Crohn's disease is transmural inflammation involving all layers.