This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'A patient is found to have a duodenal ulcer by upper endoscopy. The likelihood of this patient having H. pylori in the gastric antrum is? \nSelect and explain. \nA. 5%, B. 20%, C. 60%, D. 95%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]