<prompt> A 60 years old chronic smoker presents with complaints of haemoptysis.her chest X,-ray appears to be normal. What is the next best investigationBronchoscopyHigh resolution CTSputum cytologyPulmonary function test  <response>: CT scan is unrevealing airway inspection with bronchoscopy should be performed. CT allows better delineation of bronchiectasis, alveolar filling,cavitary infiltration and masses . Ref Harrison 19th edition pg 246,247,512 