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': 'Most effective agent to prevent motion sickness is \nSelect and explain. \nA. Ephedrine, B. Nedocromil, C. Hyoscine, D. Cyproheptadine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Moon sickness is more easily prevented than cured.\n\xa0Transdermal hyoscine (scopolamine) is the best agent for the prevention of motion sickness.\n\xa0Antihistamines can also be used for prevention.', 'role': 'assistant'}]