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
Anthrol acts as purgative due to - 
Select and explain. 
A. Irritant action, B. Bulk formation in intestinal lumen, C. Osmotic action, D. Emollient effect
A: Irritant action
Answer: A: Irritant action 
Explanation: Ans. is 'a' i.e., Irritant action o Anthroquinones (senna, cascara sagrada) are stimulant purgatives --> irritate the intestinal mucosa and thus stimulate motor activity.