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 a skeletal traction to be effective, the principles that must be met are: 
 Options:  <1> Contraction, continuity and body alignment. <2> Body alignment and joint mobility. <3> Joint mobility and continuity. <4> Contraction and body alignment. <5> Continuity, body alignment and joint mobility.
