Instructions: 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: Among the equipment used for the mixing of powders are the rotary mixers, which are usually used when the powder:
Options: <1> It has poor flow. <2> It flows freely. <3> It has an angle of repose> 90. <4> It is high intensity. <5> It contains moisture.
Output:
2