Detailed 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'.
Q: Question: The cellulose acetate filter membranes are compatible with:
Options: <1> Organic solvents. <2> Aqueous solutions <3> All solvents <4> Organic solvents, except nitrogen. <5> Nitrogen solvents.
A:
2