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: In a Gram positive pathogen involved in pharyngitis and rheumatic fever: 
 Options:  <0> Staphylococcus aureus. <1> Micrococcus luteus. <2> Moraxella catarrhalis. <3> Haemophilus influenzae. <4> Streptococcus pyogenes.
[EX A]: biology

[EX Q]: Question: Mrs. H. H. 69 years old complains that she does not sleep well. Regarding sleep in the elderly, it has been proven that: 
 Options:  <0> The non-pharmacological approach to insomnia has proved ineffective in this population. <1> The aging process is one of the main causes of insomnia. <2> They have a worse quality sleep, more fragmented and with early awakenings. <3> For the treatment of insomnia, the benzodiazepines of long half-life are those with the least side effect. <4> All hypnotics have the same side effects in the elderly.
[EX A]: nursery

[EX Q]: Question: During the exchange process in the capillaries, the net active force that attracts fluid from the interstitial space back into the capillaries is: 
 Options:  <0> Gravity. <1> Osmotic pressure of interstitial fluid. <2> Colloidal osmotic pressure of the plasma. <3> Hydrostatic blood pressure. <4> Glomerular hydrostatic pressure.
[EX A]:
nursery