This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Pharmacology
[{'content': 'Which is not an osmotic laxative? \nSelect and explain. \nA. Sorbitol, B. Magnesium Hydroxide, C. Polyethylene glycol, D. Bisacodyl', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Laxatives Bulk forming Dietary fibre Osmotic Sorbitol Lactulose Polyethylene glycol Mg(OH)2 MgSO4 Stimulant Senna Cascara Bisacodyl', 'role': 'assistant'}]