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.

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

Question: Echinocandins are antifungal compounds that act by inhibiting: 
 Options:  <0> The synthesis of ergosterol. <1> The synthesis of the cell wall. <2> The synthesis of DNA. <3> The synthesis of proteins. <4> The formation of microtubules.
pharmacology

Question: The -thalassemia can have its origin in: 
 Options:  <0> The deficit of ferroquetalase. <1> The deficit of HbA2. <2> The presence of HBH. <3> The presence of HbS. <4> The presence of methemoglobin.

pharmacology