Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Which of the following compounds can not serve as a precursor for the synthesis of glucose via gluconeogenesis ?: 
 Options:  <1> Acetate. <2> Glycerol <3> Lactate <4> Oxalacetate. <5> α-ketoglutarate.
