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': 'Ectopic ACTH syndrome is seen most commonly with- \nSelect and explain. \nA. Renal cell carcinoma, B. Lymphoma, C. Bronchogenic carcinoma, D. Pituitary adenoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]