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 kind of learning manifests itself without obvious reinforcement? 
 Options:  <1> Latent learning. <2> Vicarial learning. <3> Learning by insight. <4> Instrumental learning <5> None.
