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: Porous glass filters of 10-40m are used in particular in:
Options: <1> Analytical filtering. <2> Fine filtration <3> Help for other filtering materials. <4> Ultra-thin filtration <5> Separation of large diameter microorganisms.
Output:
1