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.

[EX Q]: Question: A motor neuron and all the muscle fibers that it innervates constitute: 
 Options:  <0> Motor plate. <1> Motor unit <2> Neuromuscular junction <3> Motor synapse <4> Motor filament
[EX A]: biology

[EX Q]: Question: Of the following scales of pain assessment in childhood, which is recommended for school children aged 7 to 8 ?: 
 Options:  <0> NFCS scale. <1> Numerical or analog scale. <2> CHEOPS scale. <3> Scale Oucher. <4> Ladder of Wong and Baker.
[EX A]: nursery

[EX Q]: Question: The MIC-A protein, expressed in various cell types and induced by cellular stress situations, is recognized by: 
 Options:  <0> KIR receivers. <1> The Major Histocompatibility Complex (MHC). <2> The NKG2D receptor. <3> B lymphocytes <4> NOD type receivers.
[EX A]:
pharmacology