<prompt> Which of the following statements about lung carcinoma is trueSquamous cell variant accounts for 70 of all lung cancerOat cell variant typically present with cavitationOat cell variant is typically associated with hilar adenopathyAdenocarcinoma variant is typically central in location  <response>: Small cell carcinoma usually occurs in central bronchi with associated mediastinal and hilar adenopathy being a common presentation at time of diagnosis Ref Harrison 19th edition pg 515 