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
All are true regarding Helicobacter pylori except - 
Select and explain. 
A. Less prevalent in developing countries, B. Toxigenic strains usually causes ulcers, C. Urea breath is positive, D. Gram negative organism
A: Less prevalent in developing countries
Answer: A: Less prevalent in developing countries 
Explanation: None