<prompt> A chronic smoker presented with mild haemoptysis. He also gave a history of hypeension and obesity. Lab data showed raised ACTH levels, which were not suppressed by high dose dexamethasone. The cause for the Cushings syndrome in the patient is :MEN IPituitary adenomaAdrenal coical adenomaEctopic ACTH secreting tumor  <response>: Answer is D Ectopic ACTH secreting tumor : Raised ACTH levels not suppressible by high dose dexamethosone in the backdrop of chronic smoking and hemoptysis lead us to a diagnosis of ectopic ACTH secretion from a bronchogenic carcinoma. 