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
Most common cause of decrease in incidence of H.pylori in the western countries is due to 
Select and explain. 
A. Change in life style, B. Increased use of PPI, C. Chemotherapy, D. Mutation in organism
A: Change in life style
Answer: A: Change in life style 
Explanation: None