This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Lalloo, 50-years-old, a chronic smoker, presents with the history of hemoptysis. He was having truncal obesity and hypertension. He had an elevated ACTH level which was not suppressible with high dose dexamethasone. What would be the most probable diagnosis - \nSelect and explain. \nA. Bilateral adrenal hyperplasia, B. Adrenal adenoma, C. Pituitary tumour, D. Ectopic ACTH producing lung cancer', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]