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
Which of the following purgative increases the fecal bulk due to their water absorbing and retaining capacity- 
Select and explain. 
A. Methyl cellulose, B. Lactulose, C. Liquid paraffin, D. Dioctyl sodium sulfosuccinate
A: Methyl cellulose
Answer: A: Methyl cellulose 
Explanation: Ans. is 'a' i.e., Methyl cellulose o Bulk forming purgatives (e.g. methycellulose) absorb water and increas the volume of stool.