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: They are fragments of the cytoplasm of a precursor cell: 
 Options:  <0> Lymphocytes <1> Megakaryocytes <2> Monocytes <3> Platelets. <4> Erythrocytes
[A]: biology


[Q]: Question: Pruritus is a typical manifestation of all the following diseases, except: 
 Options:  <0> Hodgkin lymphoma. <1> Polycythemia vera. <2> Mycosis fungoides <3> Systemic mastocytosis. <4> Acute myeloblastic leukemia.
[A]: medicine


[Q]: 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.
[A]:
biology