This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
[{'content': 'Which of the stool softners doesnot interfere with fat absorption? \nSelect and explain. \nA. Docussates, B. Phenolphtalein, C. Liquud paraffin, D. Castor oil', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phenolphtalein and castor oil are stimulant purgatives whereas docussates and liquud paraffin are stool softners.liquid paraffin may cause deficiency of fat soluble vitamins. (ref KDT 7/e p673-674)', 'role': 'assistant'}]