This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Histaminics, Subject name: Pharmacology
[{'content': 'Treatment for motion sickness for a trip next morning? \nSelect and explain. \nA. Scopalamine patch a night before, B. Tab. Ranitidine one night before and then before the trip, C. Dimenhydrinate 1 hour before, D. Omeprazole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANS. AFor the prophylaxis of motion sickness, apply scopalamine one patch behind ear at least 4-12 hours (preferably 12 hour) before anticipated exposure to motion.', 'role': 'assistant'}]