question: Q:A 44-year-old man presents to the clinic with recurrent epigastric pain following meals for a month. He adds that the pain radiates up his neck and throat. Over the counter antacids have not helped. On further questioning, he endorses foul breath upon waking in the morning and worsening of pain when lying down. He denies any recent weight loss. His temperature is 37°C  (98.6°F), respirations are 15/min, pulse is 70/min, and blood pressure is 100/84 mm Hg. A physical examination is performed which is within normal limits except for mild tenderness on deep palpation of the epigastrium. An ECG performed in the clinic shows no abnormalities. What is the next best step in the management of this patient?? 
  {'A': 'Endoscopy', 'B': 'Barium swallow', 'C': 'Lansoprazole', 'D': 'Liquid antacid', 'E': 'Ranitidine'},