In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: Phenothiazines such as chlorpromazine work by blocking receptors for this molecule, which is transported to its primary location in the tuberoinfundibular pathway. Monoamine oxidase and catechol-o-methyl transferase break down this chemical, a process enhanced by the drug reserpine. A catecholamine produced in the substantia nigra and released from the hypothalamus, this compound inhibits the release of prolactin in the pituitary gland, among other functions. Derived from tyrosine and a precursor to adrenaline, disorders that result from a deficiency in this molecule include ADHD and Parkinson's disease. For 10 points, name this inhibitory neurotransmitter implicated in arousal and addiction and supposedly central to pleasure and reward.
A:
Science