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
Bisacodyl is : 
Select and explain. 
A. Bulk forming, B. Stool softner, C. Stimulant purgative, D. Osmotic purgative
C: Stimulant purgative
Answer: C: Stimulant purgative 
Explanation: None