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.

Input: Consider Input: Question: Beta-adrenergic receptor blocking drugs: 
 Options:  <0> They cause hypotension in individuals with normal blood pressure. <1> They increase the atrio-ventricular conduction velocity. <2> They cause negative inotropism. <3> They provoke a positive chronotropic effect. <4> They increase the secretion of renin.

Output: pharmacology


Input: Consider Input: 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.

Output: biology


Input: Consider Input: Question: Von Gierke's disease is an enzyme deficit: 
 Options:  <0> Muscle glycogen phosphorylase. <1> Branching enzyme. <2> Hepatic glycogen phosphorylase. <3> Glucose 6-phosphatase. <4> Glycogen synthase.


Output: biology