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: The papillary muscles: 
 Options:  <0> They contract atrio-ventricular valves. <1> They prevent the reflux of blood to the atria. <2> They avoid the eversion of the semilunar valves. <3> They form the interventricular septum. <4> They are formed by visceral smooth muscle.
[EX A]: biology

[EX Q]: Question: Which of the following statements is true with respect to the alkaloid morphine ?: 
 Options:  <0> It is an isoquinoline alkaloid extracted from straw of Papaver somniferum. <1> It is a benzylisoquinol alkaloid extracted from latex of Papaver somniferum. <2> It is a tracheal alkaloid extracted from leaves of Papaver somniferum. <3> It is a quinolizidine alkaloid extracted from capsules of Papaver somniferum. <4> It is a pyrrolidinic alkaloid extracted from roots of Papaver somniferum.
[EX A]: pharmacology

[EX Q]: Question: The most important causative agents of cervical cancer are: 
 Options:  <0> Papilomavirus. <1> Polyomavirus <2> Retrovirus. <3> Cytomegalovirus. <4> Parvovirus.
[EX A]:
biology