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: The reactivity of various carbonyl groups is determined by their relative stability. The order of reactivity towards nucleophiles is:
Options: <0> Amides> Esters> Ketones> Aldehydes. <1> Aldehydes> Ketones> Esters> Amides. <2> Amides> Ketones> Aldehydes> Esters. <3> Aldehydes> Esters> Ketones> Amides. <4> Amides> Ketones> Esters> Aldehydes.

Answer: chemistry

Question: Question: What mineral deficit has been especially observed in pica cases?
Options: <0> Calcium deficit <1> Zinc deficit. <2> Lead deficit <3> Potassium deficit <4> Sodium deficit

Answer: psychology

Question: Question: For what purpose do Foa and Rothbaum (1998) propose the Reformulated Narrative of Trauma in its proposed intervention in PTSD ?:
Options: <0> Identify the activating stimuli of the symptoms. <1> Reduce the frequency of intrusive images. <2> Provide information that belies the beliefs related to the trauma. <3> Help to remember the experience so that it can be assimilated into the person's autobiographical memory. <4> Direct the patient's full attention from his thoughts to the external world.

Answer:
psychology