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: Reactivity is considered a source of error when using Observation as a method of obtaining information. Where does it come from?
Options: <1> From the context in which the Observation is generated. <2> Of the observed subject. <3> Of the chosen procedure. <4> From the observer. <5> Of the type of instrument chosen.
2

Question: What serum immunoglobulin will synthesize an activated B lymphocyte that has not been stimulated through CD40 ?:
Options: <1> Any. <2> IgE <3> IgM <4> IgA <5> IgG
3

Question: Corresponds to a gene mutation by transversion:
Options: <1> T C. <2> A T. <3> G A. <4> C T. <5> A G.
2