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': 'The syndrome of inappropriate and antidiuretic hormone is characterized by the following - \nSelect and explain. \nA. Hyponatremia and urine sodium excretion > 20 meq/I, B. Hypernatremia and urine sodium excretion > 20 meq/I, C. Hyponatremia and hyperkalemia, D. Hypernatremia and hypokalemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]