Which structure prevents backflow of duodenal contents into the stomach?

A. Pylorus

B. Fundus

C. Antrum

D. Cardia

It's

A) Pylorus

circular muscle wich prevents backflow of contents from the intestine to the stomach

The structure that prevents it is A. Pylorus

In order to prevent the backflow, Pylorus is divided into two parts, the tantrum that connects it to the body to the stomach, The pyloric canal that connects it to the duodenum, When the substance enter one section, the valve to another section will be closed.