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 minimum amount of auditory stimulation needed to begin to identify the lyrics of a song is a threshold: 
 Options:  <0> Absolute. <1> Subliminal. <2> Differential. <3> Relative. <4> Musical.

SOLUTION: psychology

PROBLEM: Question: The organometallic react with the nitriles giving: 
 Options:  <0> Amino acids. <1> Lactones. <2> Alcohols <3> Ketones <4> None of the above.

SOLUTION: chemistry

PROBLEM: Question: Gallium is the element that is under the aluminum in group 13 of the periodic table. Thus: 
 Options:  <0> It burns in oxygen giving Ga2O. <1> It is stable to air due to a protective oxide layer. <2> It dissolves very quickly in nitric acid. <3> It is not soluble in basic water with hydrogen evolution. <4> It has a melting point a little higher than aluminum.

SOLUTION:
chemistry