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: For what type of addiction has the community reinforcement program plus incentive therapy been proven to be a well-established treatment? 
 Options:  <1> Alcohol. <2> Cocaine. <3> Heroin. <4> Tobacco. <5> Cannabis
