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 amino acid serves as a starting point for the synthesis of porphyrins (heme group)? 
 Options:  <1> Valina <2> To the girl. <3> Asparagine <4> Lysine <5> Glycine
