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': "A 50-year old male presents with severe refractory hypeension, weakness, muscle cramps and hypokalemia, the most likely diagnosis is - \nSelect and explain. \nA. Hypoaldosteronism, B. Hyperaldosteronism, C. Cushing's syndrome, D. Pheochromocytoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: hypeension due to increased sodium reabsorption and extracellular volume expansion and potassium depletion causes multiple weakness, hypokalemia ( Harrison 17 pg 2260)', 'role': 'assistant'}]