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': 'Antiulcer drug is - \nSelect and explain. \nA. Pirenzepine, B. Methylcellulose, C. Ciprofloxacin, D. Pyrimethamine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Pirenzepine Pirenzepine is a selective M1 anti-cholinergic & usual doses inhibit acid secretion by 40-50%.", 'role': 'assistant'}]