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': 'Hypomagnesemia is associated with which of the following- \nSelect and explain. \nA. Alcoholism, B. Hypothyroidism, C. Both, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: A rising blood concentration of ethanol directly impairs tubular magnesium reabsorption, thus leading to hypomagnesemia. Hypehyroidism is a cause for hypomagnesemia and hypothyroidism causes hypermagnesemia. Reference : page 2462-63 Harrison's Principles of Internal Medicine 19th edition", 'role': 'assistant'}]