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Which of the following is an antiemetic?

  1. Loperamide

  2. Cimetidine

  3. Sucralfate

  4. Prochlorperazine

The correct answer is: Prochlorperazine

An antiemetic is a type of medication used to prevent or treat nausea and vomiting. Loperamide, cimetidine, and sucralfate are all medications that treat different conditions, but they do not have antiemetic properties. Loperamide is an antidiarrheal medication, cimetidine is used to treat acid reflux and ulcers, and sucralfate is used to treat stomach ulcers. Therefore, option D, prochlorperazine, is the only correct answer as it is commonly used as an antiemetic medication.