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: Pharmacology
[{'content': 'Lithium directly affects which \nSelect and explain. \nA. Sodium, B. Potassium, C. Magnesium, D. Calcium', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Sodium Diuretics (paicularly thiazides) decrease the renal excretion of lithium and thus may result in toxicity. This is due to increased reabsorption of Na+ and lithium ions (as a compensatory response to excessive loss of Na+).", 'role': 'assistant'}]