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: The formation of the complex called Aminophylline improves the solubility of one of the following drugs:
Options: <1> Theophylline <2> Digoxin <3> Ampicillin <4> Thioridazine. <5> Ciclosporin
Output:
1