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: What cells of the juxtaglomerular apparatus synthesize and store renin ?: 
 Options:  <1> The cells of the macula densa. <2> The mesangial cells. <3> The main cells. <4> The juxtaglomerular cells. <5> The cells interspersed.
