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': 'Bisacodyl is: \nSelect and explain. \nA. Bulk forming, B. Stool softner, C. Stimulant purgative, D. Osmotic purgative', 'role': 'user'}, {'content': 'Answer: C \nExplanation: stimulant purgatives 1.diphenylmethane( bisacodyl,sodium picosulfate) 2. Anthraquinones(senna) 3.5HT4 antagonisr(prucalopride) 4.fixed oil(castor oil) ESSENTIALS OF MEDICAL PHARMACOLOGY SEVENTH EDITION KD TRIPATHI PG NO .672', 'role': 'assistant'}]