Gastroesophageal reflux disease (GERD) can be a painful condition causing a burning sensation in the chest. It is caused by
A. a failure of the gastroesophageal sphincter to close completely.
B. a failure of the gastroesophageal sphincter to open completely.
C. a failure of the pyloric sphincter to close completely.
D. poor peristalsis in the esophagus.
A
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