This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding from the GUT and diseases of esophagus, Subject name: Medicine
[{'content': 'All of the following is true regarding G.E.R.D. except? \nSelect and explain. \nA. Occurs during transient relaxation of LES., B. Can present with nocturnal cough, C. Bicarbonate secreted by esophageal mucosa neutralizes the acid, D. Erosive esophagitis at the esophagogastric junction is the hallmark of GERD', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mechanisms of GERD: Transient LES relaxations LES hypotension Anatomic distoion of the esophagogastric junction inclusive of hiatus hernia * The acid can reflux can lead to chemical tracheitis-nocturnal cough and bronchospasm. Erosive esophagitis at the esophagogastric junction is the endoscopic hallmark of GERD In paially treated disease ambulatory 24 hours pH monitoring is done and the outcome is expressed as the percentage of the day that the pH was less than 4 (indicative of recent acid reflux), with values exceeding 5% indicative of GERD.', 'role': 'assistant'}]