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.

Q: Question: The reaction between a ketone and a Grignard reagent causes, after hydrolysing the salt formed, a:
Options: <0> Carboxylic ester. <1> Alcohol. <2> Ether. <3> Aldehyde. <4> Carboxylic acid.

A: chemistry
****
Q: Question: The SO2 molecule is:
Options: <0> Linear, with the S atom in the center. <1> Linear, with one of the atoms of O in the center. <2> Angular, with the S atom in the center and with an angle close to 120 (equilateral triangle) and a free pair of electrons. <3> Angular, with one of the atoms of O in the center and with an angle of approximately 120 (equilateral triangle) and a pair of free electrons. <4> Angular, with the S atom in the center and with an angle close to 109 (tetrahedron) and two pairs of free electrons.

A: chemistry
****
Q: Question: What aspects characterize the evaluation of children's problems compared to the evaluation of adults?
Options: <0> Employ techniques and instruments with psychometric guarantees of reliability and validity. <1> Use especially observation, emphasize overt behaviors and emphasize the external determinants of them. <2> Enable the planning of the subsequent treatment. <3> Ensure the confidentiality of the information obtained. <4> Carry out the evaluation through the application of different techniques and instruments.

A:
psychology
****