This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
[{'content': 'The Inhibition of hydrochloric acid (HC1) secretion by omeprazole occurs within an hour, reaches a peak at 2 hours, and plateaus by 4th day.After how many days will the secretion gradually normalize: \nSelect and explain. \nA. <24 hours, B. 1-2 days, C. 3-5 days, D. 3-5 days', 'role': 'user'}, {'content': 'Answer: C \nExplanation: secretion of omeprazole resumes gradually over 3-5 days of stopping drug ESSENTIALS OF MEDICAL PHARMACOLOGY SEVENTH EDITION KD TRIPATHI PG NO.652', 'role': 'assistant'}]