<prompt> In a chronic smoker which hemoptysis, he also gave a history of hypeension and obesity. Lab data showed raised ACTH levels, which are not suppressed by dexamethasone. The cause of Cushings syndrome in the patient is -MEN1Pituitary adenomaAdrenal coical adenomaEctopic ACTH secreting tumor  <response>: - History of chronic smoking and hemoptysis along with raised ACTH levels not suppressible by dexamethasone points to ectopic ACTH producing small cell carcinoma of lung. 