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
Helicobacter pylori is found in greatest number in: 
Select and explain. 
A. Oesophagus, B. Gastric Antrum, C. Caecum, D. Oral cavity
B: Gastric Antrum
Answer: B: Gastric Antrum 
Explanation: None