Task: Question Answering
Input (English): Question: Which of the following antidiabetics acts by inhibiting DPP-4 and prolonging the duration of the endogenous incretins GLP-1 and GIP ?: 
 Options:  <1> Glimepiride <2> Repaglinide. <3> Sitagliptin <4> Rosiglitazone. <5> Tolbutamide
Output (English): 3