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': 'To avoid motion sickness, an antiemetic drug should be administered: \nSelect and explain. \nA. A day before the journey, B. After ﬁrst vomiting, C. 1 hour before the journey, D. 12 hours before the journey', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hyoscine is administered half to one hour before the journey for the prevention of motion\xa0sickness. It has no role once the vomiting starts.', 'role': 'assistant'}]