This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': "True about cushing's syndrome is - \nSelect and explain. \nA. Adrenomedullary hyperplasia in association wift MEN syndrome is common cause, B. Bronchial &Mediastinal carcinoid causes wishing syndrome, C. It is diagnosed by hypokalemia in association wifo increased adrenal secretion, D. It is often fatal due to its coronary and cerebrovascular accidents", 'role': 'user'}, {'content': 'Answer: B \nExplanation: most of the cases are associated with oat cell type of bronchogenic carcinoma or with carcinoid tumor of thymus, pancreas, ovary, medullary carcinoma of thyroid, bronchial adenoma( Harrison 17 pg 2255)', 'role': 'assistant'}]