Task: Text Categorization
Input (English): Question: What transport system do thyroid follicular cells use to capture iodide through its basal pole ?: 
 Options:  <0> A primary active transporter. <1> An iodide exchanger with chloride. <2> A transporter called pendrina. <3> A process of pinocytosis. <4> A sodium iodide carrier.
Output (English): pharmacology