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': 'Antacid drug that typically causes diarrhoea \nSelect and explain. \nA. Sodium bicarbonate, B. Magnesium hydroxide, C. Calcium carbonate, D. Aluminium hydroxide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]