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': 'Which of the following purgative increases the fecal bulk due to their water absorbing and retaining capacity- \nSelect and explain. \nA. Methyl cellulose, B. Lactulose, C. Liquid paraffin, D. Dioctyl sodium sulfosuccinate', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Methyl cellulose o Bulk forming purgatives (e.g. methycellulose) absorb water and increas the volume of stool.", 'role': 'assistant'}]