This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Which of the following drugs is useful in prophylaxis of motion sickness? \nSelect and explain. \nA. Hyoscine, B. Metoclopramide, C. Prochlorperazine, D. Ondansetron', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) Hyoscine(Ref: KDT 8th/e p132)Hyoscine is used for the prophylaxis of motion sickness whereas other drugs listed in the question are used for the treatment of vomiting.', 'role': 'assistant'}]