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: Microbiology
H. pylori is found in: 
Select and explain. 
A. Epithelium, B. Mucosa, C. Muscularis mucosa, D. Adventitia
B: Mucosa
Answer: B: Mucosa 
Explanation: Mucosa