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
All the following are bulk forming laxatives except 
Select and explain. 
A. Polycarbophil, B. Psyllium, C. Methylcellulose, D. Glycerin
D: Glycerin
Answer: D: Glycerin 
Explanation: Glycerin is hyperosmotic laxative.Ref: Katzung 13thed.Pg 1090