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': 'Mechanism of hypokalemia in Gitelman syndrome is: \nSelect and explain. \nA. Mineralocoicoid excess, B. Apparent mineralocoicoid excess, C. Distal delivery of non reabsorbed anions, D. Magnesium deficiency', 'role': 'user'}, {'content': "Answer: A \nExplanation: Hypokalemia is a feature of Gitelman's syndrome Mechanism: Mineralocoicoid excess Similar mechanism seen with Primary and secondary hyperaldosteronism Malignant hypeension Renin secreting tumors Renal aery stenosis Hypovolemia Bater's syndrome Apparent mineralocoicoid excess leads to hypokalemia in Liddle's syndrome 11 beta dehydrogenase-2 deficiency Ref: Harrison, Edition-18, page-352.", 'role': 'assistant'}]