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. Cyproheptidine, D. Hyoscine', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `d' i.e., Hyoscine Motion sickness is more easily prevented than cured. Transdermal hyoscine (scopolamine) is the best agent for the prevention of /notion sickness. Antihistamines can also be used for prevention.", 'role': 'assistant'}]