Task: Question Answering
Input (English): Question: In the digestive system, the vagus: 
 Options:  <1> Stimulates the contraction of the cardia. <2> The gastro-colic reflex mediates. <3> Decreases the secretion of gastric acid. <4> Inhibits the secretion of pancreatic bicarbonate. <5> It is not choralgogo.
Output (English): 2