<prompt> Which of the following helps in diagnosis of Laryngopharyngeal refluxLower esophageal pH monitoringLower esophageal pharyngeal pH monitoringEndoscopic examination of esophagusX-ray pharynx  <response>: Answer- B. Lower esophageal pharyngeal pH monitoringIaryngopharyngeal reflux LPR is defined as the retrograde flow ofstomach content to the larynx and pharynx whereby this material comes in contact with the upper aerodigestive tract. In contrast, gastroesophageal reflux disease GERD is the flow of stomach acids back into the esophagus.Multichannel intraluminal impedance and pH-monitoring studies are most useful in confirming LPR and assessing the magnitude of the problem. Demonstration of reflux events is best achieved with ambulatory multichannel intraluminal impedance MCII and pH-monitoring studies.24 hour dual probe pH monitoring simultaneous esophageal and pharyngeal pH is used more often. 