The FALSE statement is that endoscopy must be performed for diagnosis. Typical GERD is diagnosed clinically (typical symptoms, no alarm features, response to a PPI trial). Endoscopy is kept for alarm/red-flag features, refractory cases or Barrett screening.

• B, C and D are all true: clinical diagnosis is enough, red flags need endoscopy, and 24-hour pH monitoring is the gold standard (though usually unnecessary).