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': "Intake of exogenous steroid causes: \nSelect and explain. \nA. Addison's disease, B. Cushing's syndrome, C. Pheochromocytoma, D. Conn's syndrome", 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (Cushing's syndrome): The most common cause of Cushing's syndrome is iatragenic administration of steroids for a variety of reasons. - Harrison", 'role': 'assistant'}]