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: Medicine
The histologic criteria for diagnosis of acute appendicitis is neutrophilic infiltration of - 
Select and explain. 
A. Mucosa, B. Submucosa, C. Muscularis propria, D. Serosa
C: Muscularis propria
Answer: C: Muscularis propria 
Explanation: None