instruction:
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'.
question:
Question: The most appropriate microscopy to identify Treponema pallidum in exudates from syphilitic lesions is: 
 Options:  <1> Clear field without staining. <2> Clear field with simple staining. <3> Dark field <4> Phase contrast. <5> Polarized light
answer:
3


question:
Question: The determination of cyanide by the Liebig method is based on the addition of a silver nitrate standard solution: 
 Options:  <1> Until complete precipitation of silver cyanide. <2> Until the precipitation of silver cyanide begins. <3> Until the appearance of a red precipitate of silver chromate. <4> Until the AgCN complex is quantitatively formed. <5> Until the precipitation of silver iodide, yellow.
answer:
2


question:
Question: The p-nitrobenzoic acid is: 
 Options:  <1> Less acid than benzoic acid. <2> Less acid than p-methoxybenzoic acid. <3> More acid than benzoic acid and with lower pKa. <4> More acid than benzoic acid and with higher pKa. <5> Less acid than p-methoxybenzoic acid and with lower pKa.
answer:

3