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: Point out the correct statement: 
 Options:  <0> At low pO2, myoglobin is more saturated with O2 than hemoglobin. <1> CO2 increases the affinity of hemoglobin for O2. <2> 2,3 Bisphosphoglycerate is strongly bound in oxygenated hemoglobin. <3> The tissues that produce lactate release more O 2. <4> At high pO2, hemoglobin has 2 subunits.

A: chemistry
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Q: Question: Polarography is an analytical technique that refers to: 
 Options:  <0> The absorption of electromagnetic radiation. <1> The emission of electromagnetic radiation. <2> The voltametry with mercury electrode. <3> The use of palladium as a reference electrode. <4> To the potential of asymmetry.

A: chemistry
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Q: Question: If the guanine percentage of a double-stranded DNA molecule is 30%, that of adenine is: 
 Options:  <0> 10% <1> 70% <2> 80% <3> twenty%. <4> 30%

A:
biology
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