<prompt> A patient presents with a cavitatory lesion in right upper lobe of lung. The best investigation is?Branchoscopy, lavage and brushingC.T. ScanX rayFNAC  <response>: Answer is A Bronchoscopy, lavage and brushing : The basic idea is to obtain a tissue biopsy. FNAC could he used, however it would ceainly not be the best. Bronchoscopy would allow, both, direct visualization and biopsy, and so is the best option here. 