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': 'Which of the following is not an antacid drug: March 2005 \nSelect and explain. \nA. Aluminium hydroxide, B. Magnesium sulphate, C. Sodium bicarbonate, D. Calcium carbonate', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B: Magnesium sulphate Examples of antacids Aluminium hydroxide Magnesium hydroxide, magnesium trisilicate (Phillips' Milk of Magnesia) Aluminum carbonate gel Calcium carbonate Sodium bicarbonate, Sodium citrate Bismuth subsalicylate Magaldrate", 'role': 'assistant'}]