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 Latin square designs are a type of: 
 Options:  <0> Random designs. <1> Block designs. <2> Intra-subject designs. <3> Mixed designs <4> Unifactorial designs.

SOLUTION: psychology

PROBLEM: Question: With respect to the distribution coefficient of a solute between two partially miscible liquids: 
 Options:  <0> Because it is a quotient between solute concentrations in the two phases, it is independent of temperature. <1> It does not depend on the total amount of solute in both parts. <2> It is useful to determine the molar mass of the solute. <3> If one phase is water and the other an organic solvent, it is usually used in medical and environmental chemistry to know the distribution of drugs and contaminants between these two types of media. <4> It only has physical significance when the liquid phases are in contact through a semipermeable membrane.

SOLUTION: chemistry

PROBLEM: Question: Ethylenediaminetetraacetic acid (EDTA) is a chelating agent widely used as a titrator in complexometric assessments that are characterized by: 
 Options:  <0> To make possible the EDTA titration of many metals in alkaline solutions an auxiliary complexing agent is used which prevents the metal ion from precipitating as hydroxide. <1> EDTA forms complexes of 1: 2 stoichiometry with some metal ions and therefore has a poor application in quantitative analysis. <2> It is important to choose an adequate pH to carry out the titration because metal-EDTA complexes are more stable at low pH than at high pH. <3> When evaluating a metal ion with EDTA, there is an excess of EDTA at the equivalence point. <4> When evaluating a metal ion with EDTA, there is an excess of metallic ion at the equivalence point.

SOLUTION:
pharmacology