This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'All the following are bulk forming laxatives except \nSelect and explain. \nA. Polycarbophil, B. Psyllium, C. Methylcellulose, D. Glycerin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Glycerin is hyperosmotic laxative.Ref: Katzung 13thed.Pg 1090', 'role': 'assistant'}]