TASK DEFINITION: In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
PROBLEM: Question: The sequencing of an oligosaccharide is done by: 
 Options:  <0> Degradation Edman. <1> Chromatography Whatman. <2> Patch-Clamp. <3> Mass spectrometry. <4> Capillary electrophoresis.

SOLUTION: pharmacology

PROBLEM: Question: In which of the drugs with antiviral activity does the purine base called guanine appear? 
 Options:  <0> Lamivudine <1> Zidovudine <2> Ribavirin <3> Acyclovir <4> Didanosine

SOLUTION: pharmacology

PROBLEM: Question: An Au-Ag alloy: 
 Options:  <0> It is interstitial, and can occur in any composition. <1> It is substitutional, and can occur in any composition. <2> Gold and silver can not be alloyed. <3> A small amount of gold can be dissolved in silver, up to a limit of close to 10%, but not in a greater proportion. <4> A small amount of silver can be dissolved in the gold, up to a limit close to 10%, but not in a greater proportion.

SOLUTION:
chemistry