This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
[{'content': 'Levosulpiride acts as an antagonist of which central dopamine receptor \nSelect and explain. \nA. D1, B. D2, C. D3, D. D4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: D2 receptor antagonists being explored as prokinetic agents include levosulpiride, the levo-enantiomer of sulpiride Levosulpiride is claimed to have mood elevating propeies. Levosulpiride is used in the treatment of psychoses, paicularly negative symptoms of schizophrenia, anxiety disorders, dysthymia, veigo, dyspepsia, irritable bowel syndrome and premature ejaculation. Ref: G&G 12e pg:1506', 'role': 'assistant'}]