This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sedative-Hypnotics and Parkinsonism, Subject name: Pharmacology
[{'content': 'Carbamazepine in elderly patient can cause \nSelect and explain. \nA. Hyponatremia, B. Hypokalemia, C. Hyperkalemia, D. Hypernatremia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Carbamazepine DOC for focal seizures DOC for trigeminal neuralgia Used for Diabetes insipidus Bipolar disorder Adverse effect - Release of ADH (leading to dilutional hyponatremia), Agranulocytosis, Aplastic anaemia', 'role': 'assistant'}]