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: Which of the following answers is correct regarding a tRNA? 
 Options:  <0> The tRNA has an anticodon that recognizes the template DNA. <1> The amino acid is attached to the 5'-end. <2> It contains a polyA tail at its 3 'end. <3> It may contain pseudouridin and inosine. <4> It serves as a gene for some viruses.
[EX A]: chemistry

[EX Q]: Question: Which of the following pairings between anticoagulant drug and mechanism of action is INCORRECT? 
 Options:  <0> Heparin - cofactor of antithrombin III. <1> Acenocoumarol - inhibits vitamin K epoxide reductase. <2> Dabigatran - inhibits thrombin. <3> Rivaroxaban - inhibits factor Xa. <4> Warfarin - inhibits the absorption of vitamin K.
[EX A]: medicine

[EX Q]: Question: On which of the following enzymes does citrate exert a positive allosteric effect? 
 Options:  <0> Pyruvate kinase. <1> Acetyl CoA carboxylase. <2> Fosfofructoquinasa. <3> Fatty acid synthetase. <4> Enolasa
[EX A]:
chemistry