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: On the molecular biology of cancer: 
 Options:  <0> Oncogenes are mutated derivatives of normal genes, called protooncogenes, whose function is to promote cell proliferation or survival. <1> Oncogenes are genes that synthesize proteins that inhibit cell proliferation. <2> The tumor suppressor genes synthesize proteins that inhibit cell death. <3> Protooncogenes synthesize proteins that promote cell death. <4> Apoptosis is a form of activation of proto-oncogenes.

A: chemistry
****
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.

A: chemistry
****
Q: Question: Why mechanism produces hyperprolactinemia haloperidol ?: 
 Options:  <0> Blockade of alpha 1 adrenergic receptors. <1> Blockade of alpha-2 adrenergic receptors <2> Blocking of H1 receivers. <3> Blockade of D2 receivers. <4> Blocking of 5-HT2 receptors.

A:
pharmacology
****