The five-carbon compound used for the biosynthesis of terpenes is called isopentenyl pyrophosphate. Which of the following is the structure of isopentenyl pyrophosphate? 
Definitions:
GABA
Gamma-Aminobutyric Acid, a neurotransmitter in the brain that inhibits nerve transmission, playing a key role in reducing neuronal excitability and anxiety.
Serotonin Metabolism
The biological process by which the neurotransmitter serotonin is produced, used, and broken down in the body.
SSRI
Stand for Selective Serotonin Reuptake Inhibitors, a class of drugs used to treat depression by increasing the level of serotonin in the brain.
Paroxetine
A medication commonly used to treat depression, anxiety disorders, and other mental health conditions, belonging to the selective serotonin reuptake inhibitor (SSRI) class.
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