Which of the following conditions is caused by a backflux of acid and a weak lower esophageal sphincter?
  1. Achalasia
  2. Mallory-Weiss syndrome
  3. Hiatal hernia
  4. Gastroesophageal reflux disease
Explanation
Answer: D - GERD is a chronic condition caused by acid reflux due to backflow from the stomach into the esophagus. The most often complication is a weak lower esophageal sphincter.
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