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 Q]: Question: They are reservoirs of Q fever (Coxiella burnetti): 
 Options:  <1> Bats <2> Poultry. <3> Rodents <4> Dogs. <5> Cows, sheep and goats.
[EX A]: 5

[EX Q]: Question: In gas chromatography, derivatization is very common, with several objectives. One of those discussed below is not among them: 
 Options:  <1> Increase the volatility of non-volatile compounds. <2> Avoid the decomposition of a compound, improving its stability. <3> Reduce the absorption on active surfaces of the walls of the column and the solid support. <4> Fragment the analyte in molecular ions of easier separation. <5> Improve the separation of closely related compounds with a very poor separation.
[EX A]: 4

[EX Q]: Question: He is presented with a cohort study involving 1000 female smokers and 2000 non-smoking women of the same age. If, after 5 years, 30 smokers and 20 nonsmoking women have experienced a stroke, what would be the relative risk and the attributable risk? 
 Options:  <1> Relative risk = 3, attributable risk = 10 out of every 1000. <2> Relative risk = 3, attributable risk = 20 out of every 1000. <3> Relative risk = 1.5, attributable risk = 10 out of every 1000. <4> Relative risk = 1.5, attributable risk = 30 out of 1000. <5> Relative risk = 10 out of 1000, attributable risk = 3.
[EX A]:
2