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: What are the components of a functional heme group ?: 
 Options:  <0> Four molecules of bilirubin and one Fe3 +. <1> Four globins (2alpha + 2beta) and one Fe3 +. <2> One molecule of protoporphyrin and one Fe2 +. <3> One molecule of bilirubin and one Fe2 +. <4> Four globins (2alpha + 2beta) and one Fe2 +.

A: pharmacology
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Q: Question: The oxygen of the ethers as that of the alcohols can be protonated to generate: 
 Options:  <0> Iminium ion. <1> Alkaloxonium ions. <2> Peroxides <3> Piranos. <4> Enaminas

A: chemistry
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Q: Question: A compound that has a five-membered aromatic heterocyclic skeleton with three carbon atoms and two nitrogens, the latter being positions 1 and 3, is called: 
 Options:  <0> Pirrol. <1> Pyrimidine <2> Pyrazole <3> Pyrazolidine. <4> Imidazole

A:
chemistry
****