This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peptic Ulcer Disease, Subject name: Medicine
[{'content': 'GERD is defined as pH of oesophagus< ____ and for > _______% of total day time. \nSelect and explain. \nA. 4 and 5, B. 5 and 4, C. 4 and 10, D. 5 and 10', 'role': 'user'}, {'content': 'Answer: A \nExplanation: pH of esophagus< 4 for > 5% of total day time is defined as GERD There is Demeester score for the severity of GERD GERD can be due to * Hiatus Hernia * Incompetent LES (Coffee, tea, stress) GERD causes - Chemical laryngitis, chemical tracheitis - Nocturnal cough* -Asthma -Dental erosions', 'role': 'assistant'}]