The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Hyponatremia is defined as a serum Na+ level   (A) < 135 mmol/L   (B) > 135 mmol/L   (C) < 160 mmo/L   (D) < 100 mmo/L
['(A) < 135 mmol/L <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) < 135 mmol/L \n (B) > 135 mmol/L \n (C) < 160 mmo/L \n (D) < 100 mmo/L <> possible answers', '  Hyponatremia is defined as a serum Na+ level <> context@']