Task: Text Categorization
Input (English): Question: The syndrome of inadequate secretion of antidiuretic hormone (SIADH) is characterized by: 
 Options:  <0> Hyponatremia <1> Hypovolemia <2> Concentrations of sodium ion in urine less than 20 mmol / L. <3> Osmolality in urine less than serum osmolality. <4> High concentrations of calcium ion.
Output (English): pharmacology