<prompt> Placement of a double lumen tube for lung surgery is best confirmed byEtCO2Airway pressure measurementClinically by auscultationBronchoscopy  <response>: Best confirmation of tracheal placement i.e. detection whether tube is in trachea or esophagus capnography end tidal CO2Best confirmation of double lumen tube placement whether in trachea or bronchus flexible fibreoptic bronchoscopy. 