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: Consider Input: Question: What values obtained in an arterial blood gas are considered within the normal parameters in an adult person ?:
Options: <1> PaCO2 65mmHg, PaO2 80mmHg, pH 7.55. <2> PaCO2 35mmHg, PaO2 110mmHg, pH 7.55. <3> PaCO2 35mmHg, PaO2 90mmHg, pH 7.35. <4> PaCO2 80mmHg, PaO2 35mmHg, pH 7.35. <5> PaCO2 20mmHg, PaO2 90mmHg, pH 7.45.

Output: 3

Input: Consider Input: Question: The reaction of Wolff-Kishner is one:
Options: <1> Oxidation of carbonyls to give acids. <2> Reduction of carbonyls to alcohols. <3> Deoxygenation of carbonyls that takes place in an acid medium. <4> Deoxygenation of carbonyls that is carried out in an alkaline medium. <5> Carbonyl deoxygenation performed in neutral medium.

Output: 4

Input: Consider Input: Question: In which of the drugs with antiviral activity does the purine base called guanine appear?
Options: <1> Lamivudine <2> Zidovudine <3> Ribavirin <4> Acyclovir <5> Didanosine
Output: 4