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.
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Question: Question: Reactions in which there are no intermediates are described as: 
 Options:  <0> Concerted. <1> Polar <2> Radicals <3> Homolitic <4> Heterolithic

Answer: chemistry


Question: 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.

Answer: psychology


Question: Question: In the homogeneous nucleation: 
 Options:  <0> If the solid particles formed under solidification have a radius less than the critical radius, the energy of the system will be lower if its size increases. <1> If the solid particles formed under solidification have a radius smaller than the critical radius, the energy of the system will be lower if it is redissolved. <2> If the solid particles formed under solidification have a radius greater than the critical radius, the energy of the system will be lower if it is redissolved. <3> If the solid particles formed under solidification have a radius equal to the critical, the energy of the system will be lower if it is redissolved. <4> There is no relationship between the critical radius and the tendency to grow in size or redissolve.

Answer:
chemistry