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: The simultaneous expression of IgM and IgD is observed for the first time in lymphocytes:
Options: <1> Early Pro-B. <2> B mature. <3> Late Pro-B. <4> Pre-B. <5> B immature

Ex Output:
2

Ex Input:
Question: The oxygen of the ethers as that of the alcohols can be protonated to generate:
Options: <1> Iminium ion. <2> Alkaloxonium ions. <3> Peroxides <4> Piranos. <5> Enaminas

Ex Output:
2

Ex Input:
Question: DNA fotoliasa:
Options: <1> Repairs cyclobutane pyrimidine dimers in the presence of visible light. <2> It binds to DNA specifically in purine dimers. <3> It contains three chromophores. <4> It is present in all eukaryotic cells. <5> It breaks the bonds that link pyrimidine rings and then dissociates in the presence of visible light.

Ex Output:
1