TASK DEFINITION: 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.
PROBLEM: Question: They are primary lymphoid organs:
Options: <0> Spleen and lymph nodes <1> The spleen and bone marrow. <2> The thymus and the bone marrow. <3> The pineal gland <4> Peyer's plates and tonsils.

SOLUTION: biology

PROBLEM: Question: Among the partial reactions that lead to sodium carbonate by the Solvay Process, are:
Options: <0> The reaction between calcium carbonate and sodium chloride. <1> The precipitation of sodium hydrogen carbonate. <2> The thermal decomposition of ammonium chloride. <3> The formation of CaCO3 from CaO and CO2. <4> The reaction of ammonia with calcium oxide.

SOLUTION: chemistry

PROBLEM: 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

SOLUTION:
biology