This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Antiemetic effect of Metoclopromide is mainly due to its action as \nSelect and explain. \nA. 5HT3 antagonist, B. D2 antagonist, C. M3 antagonist, D. 5HT4 agonist', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Antiemetic effect of Metoclopramide is because of D2 antagonism\xa0> 5HT3 antagonism.\nProkinetic effect is due to 5HT4 agonism.', 'role': 'assistant'}]