Task: Text Categorization
Input (English): Question: In the digestive system, the vagus: 
 Options:  <0> Stimulates the contraction of the cardia. <1> The gastro-colic reflex mediates. <2> Decreases the secretion of gastric acid. <3> Inhibits the secretion of pancreatic bicarbonate. <4> It is not choralgogo.
Output (English): biology