Answer: A) Helicobacter pylori
Explanation:
Helicobacter pylori is the characteristics of tumor promoting which contain microaerophilic bacterium in stomach. It is also developed for the stomach cancer and the duodenal ulcers. Basically, it is the type of bacteria and enter in our body and destroy our digestive tract and lead infection in stomach. After some times they caused sores in stomach, upper part in small intestine.
