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
A 50-year old male presents with severe refractory hypeension, weakness, muscle cramps and hypokalemia, the most likely diagnosis is - 
Select and explain. 
A. Hypoaldosteronism, B. Hyperaldosteronism, C. Cushing's syndrome, D. Pheochromocytoma
B: Hyperaldosteronism
Answer: B: Hyperaldosteronism 
Explanation: hypeension due to increased sodium reabsorption and extracellular volume expansion and potassium depletion causes multiple weakness, hypokalemia ( Harrison 17 pg 2260)