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'.

Ex Input:
Question: Ultraviolet radiation changes the structure of DNA by: 
 Options:  <1> Rupture of phosphodiester bonds. <2> Deamination of nitrogenous bases. <3> Depurinization <4> Formation of cyclobutyl rings of pyrimidines. <5> Hydroxylation of nitrogenous bases.

Ex Output:
4


Ex Input:
Question: Sulfasalazine is used for the treatment of ulcerative colitis. It is a prodrug of 5-aminosalicylic acid that is activated by a process of: 
 Options:  <1> Hydrolysis of an ester. <2> Hydrolysis of an amide. <3> Oxidative dealkylation. <4> Reducing rupture of the azoderivative. <5> Aromatic hydroxylation.

Ex Output:
4


Ex Input:
Question: Which of the following in an oncogene whose transcription product is a membrane receptor with tyrosine kinase activity of a growth factor? 
 Options:  <1> HER2 / neu. <2> p53. <3> myc <4> APC. <5> Ras.

Ex Output:

1