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
True about H. pylori - 
Select and explain. 
A. Seen in 85 to 90% cases of gastric ulcer, B. Seen in 20 to 25% cases of duodenal ulcer, C. Transmitted from man to man, feco-orally & by orogastric route, D. Common in adults of developing countries
C: Transmitted from man to man, feco-orally & by orogastric route
Answer: C: Transmitted from man to man, feco-orally & by orogastric route 
Explanation: None